#include<iostream>
#include<queue>
#include<algorithm>
using namespace std;
int num[102][102], r, c, dp[102][102], ans;
int dv[4][2] = { 1,0,-1,0,0,1,0,-1 };
struct NU {
	int value, x, y;
	bool operator < (const NU nu) const {
		return this->value < nu.value;
	}
};
priority_queue<NU> q;

inline NU make_nu(int value, int x, int y) {
	NU ans = { value,x,y };
	return ans;
}

int maxaround(int x, int y) {
	int ans = 0, xx, yy;
	for (int i = 0; i < 4; ++i) {
		xx = x + dv[i][0], yy = y + dv[i][1];
		ans = max(ans, dp[xx][yy] + (num[xx][yy] != num[x][y]));
	}
	return ans;
}

int main() {
	scanf("%d%d", &r, &c);
	for (int i = 1; i <= r; ++i) {
		for (int j = 1; j <= c; ++j) {
			scanf("%d", &num[i][j]);
			q.push(make_nu(num[i][j], i, j));
		}
	}
	while (!q.empty()){
		NU t = q.top();
		q.pop();
		dp[t.x][t.y] = maxaround(t.x, t.y);
		ans = max(ans, dp[t.x][t.y]);
	}
	/*if (r == 1 && c == 1)printf("1");
	else*/ printf("%d", ans);
	return 0;
}

就是最后 return 0 之前那个注释那里，测试点#4的数据经过测试是1 1 1 答案为 1，我程序跑1 1 1的结果也是 1 ，但是就是wa，然后测完数据加个注释里的内容就过了，想请教一下为什么程序本身跑的 1 过不去