Revisions to We're Spiralling out of control, Doctor!

added 343 characters in body

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edited May 17, 2015 at 13:38

32.2k
3
36
90

#JavaScript (ES6) 163124 ~~177163 177~~

Edit Totally different way, no need of an array to store visited cells. Using the fact that the side of the spiral increase of 1 after every 2 turns.

// GolfedNew way
f=(h,w,y,x)=>
  (e=>{
    for(o=[],d=i=t=l=0;l<w*h;i<t?i+=2:[i,d,e]=[1,-e,d,++t])
      o[l]=y*w-w+x,l+=x>0&x<=w&y>0&y<=h,x+=d,y-=e
  })(1)||o


// Golfed
g=(h,w,y,x)=>
  (g=>{
    for(e=n=0;n<h*w;)g[[n%w+1,-~(n/w)]]=++n;
    for(o=[g[[x,y]]],l=d=1;l<n;l+=!!(o[l]=g[[x+=d,y+=e]]))
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d])
  })([])||o



// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

#JavaScript (ES6) 163 ~~177~~

// Golfed
f=(h,w,y,x)=>
  (g=>{
    for(e=n=0;n<h*w;)g[[n%w+1,-~(n/w)]]=++n;
    for(o=[g[[x,y]]],l=d=1;l<n;l+=!!(o[l]=g[[x+=d,y+=e]]))
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d])
  })([])||o



// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

#JavaScript (ES6) 124 ~~163 177~~

Edit Totally different way, no need of an array to store visited cells. Using the fact that the side of the spiral increase of 1 after every 2 turns.

// New way
f=(h,w,y,x)=>
  (e=>{
    for(o=[],d=i=t=l=0;l<w*h;i<t?i+=2:[i,d,e]=[1,-e,d,++t])
      o[l]=y*w-w+x,l+=x>0&x<=w&y>0&y<=h,x+=d,y-=e
  })(1)||o


// Golfed
g=(h,w,y,x)=>
  (g=>{
    for(e=n=0;n<h*w;)g[[n%w+1,-~(n/w)]]=++n;
    for(o=[g[[x,y]]],l=d=1;l<n;l+=!!(o[l]=g[[x+=d,y+=e]]))
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d])
  })([])||o



// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

added 278 characters in body

Source Link

edited May 16, 2015 at 13:25

edc65

32.2k
3
36
90

#JavaScript (ES6) 167163 ~~177~~

// Golfed
f=(h,w,y,x)=>
  (g=>{
    for(n=0;n<h*w;ne=n=0;n<h*w;)g[[n%w+1,-~(n/w)]]=++n;
    for(o=[g[[x,y]]],l=d=1l=d=1;l<n;l+=!!(o[l]=g[[x+=d,e=0;l<n;y+=e]]))
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d]),
      l+=!!(o[l]=g[[x+=d,y+=e]])
  })([])||o    



// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

#JavaScript (ES6) 167 ~~177~~

// Golfed
f=(h,w,y,x)=>
  (g=>{
    for(n=0;n<h*w;n)g[[n%w+1,-~(n/w)]]=++n;
    for(o=[g[[x,y]]],l=d=1,e=0;l<n;)
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d]),
      l+=!!(o[l]=g[[x+=d,y+=e]])
  })([])||o    



// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

#JavaScript (ES6) 163 ~~177~~

// Golfed
f=(h,w,y,x)=>
  (g=>{
    for(e=n=0;n<h*w;)g[[n%w+1,-~(n/w)]]=++n;
    for(o=[g[[x,y]]],l=d=1;l<n;l+=!!(o[l]=g[[x+=d,y+=e]]))
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d])
  })([])||o



// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

added 278 characters in body

Source Link

edited May 16, 2015 at 13:17

edc65

32.2k
3
36
90

#JavaScript (ES6) 177167 ~~177~~

// Golfed
f=(h,w,y,x)=>
  (g=>{
    for(g=[],n=0;n<h*w;n)g[[n%w+1,-~(n/w|0w)+1]]=++n;]]=++n;
    for(o=[g[[x,y]]],l=d=1,e=0;l<n;)
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d]),
    x+=d,y+=e,
    l+=!!(k=g[[xo[l]=g[[x+=d,y]]y+=e]])?o[l++]=k:0
  return})([])||o o   
}


// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

#JavaScript (ES6) 177

// Golfed
f=(h,w,y,x)=>{
  for(g=[],n=0;n<h*w;n)g[[n%w+1,(n/w|0)+1]]=++n;
  for(o=[g[[x,y]]],l=d=1,e=0;l<n;)
    g[[x,y]]=0,
    g[[x+e,y-d]]!=0&&([d,e]=[e,-d]),
    x+=d,y+=e,
    (k=g[[x,y]])?o[l++]=k:0
  return o
}


// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

#JavaScript (ES6) 167 ~~177~~

// Golfed
f=(h,w,y,x)=>
  (g=>{
    for(n=0;n<h*w;n)g[[n%w+1,-~(n/w)]]=++n;
    for(o=[g[[x,y]]],l=d=1,e=0;l<n;)
      g[[x,y]]=0,
      g[[x+e,y-d]]!=0&&([d,e]=[e,-d]),
      l+=!!(o[l]=g[[x+=d,y+=e]])
  })([])||o    



// Not golfed
u=(h,w,y,x)=>{
  var i,j,dx,dy,kx,ky,o,n,
    g={} // simulate a 2dimensional array using a hashtable with keys in the form 'x,y'

  for(n=i=0; i++<h;) // fill grid (probably better done in a single loop)
    for(j=0; j++<w;)
      g[[j,i]] = ++n;
  o=[g[[x,y]]] // starting point in output
  dx=1, dy=0 // start headed right
  
  for(; !o[w*h-1]; ) // loop until all w*h position are put in output
  {
    g[[x, y]] = 0 // mark current position to avoid reusing
    kx=dy, ky=-dx // try turning left
    if(g[[x+kx, y+ky]] != 0) // check if position marked
    { // found a valid position
      dx=kx, dy=ky // change direction
    }
    x+=dx, y+=dy // move
    k=g[[x, y]] // get current value
    if (k) o.push(k) // put in output list if not 'undefined' (outside grid)
  }
  return o
}

// TEST - In FireFox

out=x=>O.innerHTML+=x+'\n';
[
 [[5,5,3,3],'13 8 7 12 17 18 19 14 9 4 3 2 1 6 11 16 21 22 23 24 25 20 15 10 5'],
 [[2,4,1,2],'2 1 5 6 7 3 8 4']
].forEach(t=>out(t[0] + '\n Result: ' + f(...t[0])+'\n Check:  ' + t[1]))

test=()=>
{
  var r, i=I.value.match(/\d+/g), h=i[0]|0, w=i[1]|0, y=i[2]|0, x=i[3]|0
  if (y>h||x>w) r = 'Invalid input'
  else r = f(h,w,y,x)
  out(i+'\n Reault: ' +r)
}

<pre id=O></pre>
Your test:<input id=I><button onclick="test()">-></button>

Post Undeleted by edc65

occurred May 16, 2015 at 13:06

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edited May 16, 2015 at 13:06

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Post Deleted by edc65

occurred May 16, 2015 at 13:00

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edited May 16, 2015 at 12:59

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added 278 characters in body

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edited May 16, 2015 at 10:54

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created May 16, 2015 at 10:22

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