class solution { public: int flag = 1; int res = 0; int max1 = 0; void backtracing(vector<vector<int>>&nums, int m, int n) {//清除完毕来到这个地方 int size = nums.size(); if (flag == 1) { if (m == size - 1 && n == size - 1) { flag = 2; backtracing(nums, size - 1, siz...