（好像）发现了一组 hack 数据：
```
3 3
RRR
RRR
RRR
```
改完后 57pts，求指点！！！赏关注
by zym0325 @ 2023-07-02 19:12:35
好了，自己改过来了。
```cpp
#include <bits/stdc++.h>
#define inf 1e9
using namespace std;
int w[60], b[60], r[60], n, m, minn = inf;
char c;
int main() {
cin >> n >> m;
for(int i = 1; i <= n; i++)
for(int j = 1; j <= m; j++) {
cin >> c;
if(c != 'W') w[i]++;
if(c != 'B') b[i]++;
if(c != 'R') r[i]++;
}
/*for(int i = 1; i <= n; i++) cout << w[i] << " "; cout << endl;
for(int i = 1; i <= n; i++) cout << b[i] << " "; cout << endl;
for(int i = 1; i <= n; i++) cout << r[i] << " "; cout << endl;*/
for(int i = 1; i <= n; i++)
for(int j = i + 1; j < n; j++) { // <= -> <
int now = 0;
for(int x = 1; x <= i; x++) now += w[x];
for(int x = i + 1; x <= j; x++) now += b[x];
for(int x = j + 1; x <= n; x++) now += r[x];
if(now < minn) minn = now;
}
cout << minn;
return 0;
}
```
by zym0325 @ 2023-07-02 19:14:39