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edited Jan 3, 2021 at 13:51

Ruby, 50 bytes

->x,y,m,r=c=t=0{t+=m[r][(c+=x)%11]while m[r+=y];t}

Expects a matrix of \$0\$s and \$1\$s. It is given that m[0][0] is never a tree, so I always skip it.

->x,y,m,r=c=t=0{t+=m[r][(c+=x)%11]while m[r+=y];t}

Expects a matrix of \$0\$s and \$1\$s.

->x,y,m,r=c=t=0{t+=m[r][(c+=x)%11]while m[r+=y];t}

Expects a matrix of \$0\$s and \$1\$s. It is given that m[0][0] is never a tree, so I always skip it.

added 8 characters in body

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edited Jan 3, 2021 at 13:37

->x,y,m,r=c=t=0{t+=m[r][(c+=x)%11]while m[r+=y];t}

Expects a matrix of 0s\$0\$s and 1s\$1\$s.

->x,y,m,r=c=t=0{t+=m[r][(c+=x)%11]while m[r+=y];t}

Expects a matrix of 0s and 1s.

->x,y,m,r=c=t=0{t+=m[r][(c+=x)%11]while m[r+=y];t}

Expects a matrix of \$0\$s and \$1\$s.

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created Jan 3, 2021 at 13:31

->x,y,m,r=c=t=0{t+=m[r][(c+=x)%11]while m[r+=y];t}

Expects a matrix of 0s and 1s.

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