Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right, which minimizes the sum of all numbers along its path.
Note: You can only move either down or right at any point in time.
Example 1:
Input: grid = [[1,3,1],[1,5,1],[4,2,1]]
Output: 7
Explanation: Because the path 1 → 3 → 1 → 1 → 1 minimizes the sum.
Example 2:
Input: grid = [[1,2,3],[4,5,6]]
Output: 12
Memoize by simply storing the minimum path to a cell via the top or left cell.
Input:
[[1, 3, 1],
[1, 5, 1],
[4, 2, 1]]
Memoized:
[[ 1, 4, 5 ],
[ 2, 7, 6 ],
[ 6, 8, 7 ]]
Solution will be the bottom right cell in the memoized array.
/** * @param {number[][]} grid * @return {number} */ var minPathSum = function(grid) { let ret = new Array(grid.length).fill(0).map((x) => new Array(grid[0].length).fill(0)); for ( let i = 0 ; i < grid.length ; i++ ) { for ( let j = 0 ; j < grid[0].length ; j++ ) { if (i===0 && j===0) ret[i][j] = grid[i][j]; else if (i===0) ret[i][j] = grid[i][j] + ret[i][j-1]; else if (j===0) ret[i][j] = grid[i][j] + ret[i-1][j]; else ret[i][j] = grid[i][j] + Math.min(ret[i-1][j], ret[i][j-1]); } } return ret[grid.length-1][grid[0].length-1]; }; |
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