LeetCode #807. Max Increase to Keep City Skyline 保持城市天际线

https://leetcode-cn.com/problems/max-increase-to-keep-city-skyline/

执行用时 : 3 ms, 在Max Increase to Keep City Skyline的Java提交中击败了95.31% 的用户 内存消耗 : 37.7 MB, 在Max Increase to Keep City Skyline的Java提交中击败了92.13% 的用户

最直接的思路：

1. 获取矩阵的每一行最大值和每一列最大值
2. 根据上述最大值来“提高”建筑

 class Solution {
     public int maxIncreaseKeepingSkyline(int[][] grid) {
         int result = 0;
         int rowSize = grid.length;
         // rowMax 每行最大数值
         int[] rowMax = new int[rowSize];

         int colSize = grid[0].length;
         // colMax 每列最大数值
         int[] colMax = new int[colSize];

         int i = 0;
         int j = 0;

         for (i = 0; i < rowSize; i++) {
             rowMax[i] = 0;
             for (j = 0; j < colSize; j++) {
                 if (grid[i][j] > rowMax[i]) {
                     rowMax[i] = grid[i][j];
                 }
             }
         }

         for (j = 0; j < colSize; j++) {
             colMax[j] = 0;
             for (i = 0; i < rowSize; i++) {
                 if (grid[i][j] > colMax[j]){
                     colMax[j] = grid[i][j];
                 }
             }
         }

         for (i = 0; i < rowSize; i++) {
             for (j = 0; j < colSize; j++) {
                 if (rowMax[i] > colMax[j]) {
                     result += colMax[j] - grid[i][j];
                 } else {
                     result += rowMax[i] - grid[i][j];
                 }
             }
         }

         return result;
     }
 }