# 2482. Difference Between Ones and Zeros in Row and Column
###### tags: `Leetcode` `Medium`
Link: https://leetcode.com/problems/difference-between-ones-and-zeros-in-row-and-column/description/
## 思路
按照题意来 先算出```onesRow```和```onesCol``` 然后```zerosRow```和```zerosCol```就可以用```m```和```n```减```onesRow```和```onesCol```得到
## Code

class Solution {
    public int[][] onesMinusZeros(int[][] grid) {
        int m = grid.length, n = grid[0].length;
        int[] onesRow = new int[m];
        int[] onesCol = new int[n];
        for(int i=0; i<m; i++){
            for(int j=0; j<n; j++){
                if(grid[i][j]==1) onesRow[i]++;
            }
        }
        for(int i=0; i<n; i++){
            for(int j=0; j<m; j++){
                if(grid[j][i]==1) onesCol[i]++;
            }
        }
        int[][] diff = new int[m][n];
        for(int i=0; i<m; i++){
            for(int j=0; j<n; j++){
                diff[i][j] = onesRow[i]+onesCol[j]-(m-onesRow[i])-(n-onesCol[j]);
            }
        }
        return diff;
    }
}