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My answer : 76 characters, ES6, JavaScript

W=a=>(j=>{for(k=i=a.length-1;~i&~j;)a[i][j]?(k=j,i--):j--})(a[0].length-1)|k

Takes array of array input.


My answer : 76 characters, ES6, JavaScript

W=a=>(j=>{for(k=i=a.length-1;~i&~j;)a[i][j]?(k=j,i--):j--})(a[0].length-1)|k

Takes array of array input.

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10 added 181 characters in body
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My answer : 76 characters, ES6, JavaScript

W=a=>(j=>{for(k=i=a.length-1;~i&~j;)a[i][j]?(k=j,i--):j--})(a[0].length-1)|k

Takes array of array input.


My answer : 76 characters, ES6, JavaScript

W=a=>(j=>{for(k=i=a.length-1;~i&~j;)a[i][j]?(k=j,i--):j--})(a[0].length-1)|k

Takes array of array input.

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5 clarification and some typos
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