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var shiftGrid = function(grid, k) {    let len0 = grid.length;    let len1 = grid[0].length;    var arr = [];    var c = 0;    for(let i = 0; i < len0; i++){        for(let j = 0; j < len1; j++){            arr[c] = grid[i][j];            c++;        }    }    for(let i = 0; i < k; i++){        let a = arr[c - 1];        arr.pop();        arr.unshift(a);;    }    var c = 0;    for(let i = 0; i < len0; i++){        for(let j = 0; j < len1; j++){            grid[i][j] = arr[c];            c++;        }    }    return grid;};

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