Sort the Matrix Diagonally（C++将矩阵按对角线排序）

冷不防 2022-12-30 07:40 122阅读 0赞

解题思路：

（1）先找一个顺序，从下往上，从左到右

（2）先排序再赋值

class Solution {
    public:
        vector<vector<int>> diagonalSort(vector<vector<int>>& mat) {
            int row = mat.size()-1;
            int col = mat[0].size()-1;
            
            //排序
            vector<vector<int>> vec;
            for(int i=row;i>=0;i--) {
                vector<int> v;
                int j=0,temp=i;
                while(temp<=row && j<=col) {
                    v.push_back(mat[temp][j]);
                    temp++;
                    j++;
                }
                sort(v.begin(),v.end());
                vec.push_back(v);
            }
            
            for(int i=1;i<=col;i++) {
                vector<int> v;
                int j=0,temp=i;
                while(temp<=col && j<=row) {
                    v.push_back(mat[j][temp]);
                    temp++;
                    j++;
                }
                sort(v.begin(),v.end());
                vec.push_back(v);
            }
            
            //赋值
            for(int i=row;i>=0;i--) {
                int j=0,temp=i,count=0;
                while(temp<=row && j<=col) {
                    mat[temp][j] = vec[row-i][count];
                    temp++;
                    j++;
                    count++;
                }
            }
            
            for(int i=1;i<=col;i++) {
                int j=0,temp=i,count=0;
                while(temp<=col && j<=row) {
                    mat[j][temp] = vec[row+i][count];
                    temp++;
                    j++;
                    count++;
                }
            }
            
            return mat;
        }
    };