Submission #293886

#	Time	Username	Problem	Language	Result	Execution time	Memory
293886		BThero	Monochrome Points (JOI20_monochrome)	C++17	35 / 100	1099 ms	512 KiB

monochrome

// chrono::system_clock::now().time_since_epoch().count()
#include<bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define debug(x) cerr << #x << " = " << x << endl;

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int MAXN = 300 + 5;
const int INF = (int)1e9;

char s[2 * MAXN];
int n, ans;

void solve() {
  scanf("%d", &n);
  scanf("%s", s);
  
  for (int i = 0; i < 2 * n; ++i) {
    vector<char> vec;
  
    for (int j = 0; j < n; ++j) {
      vec.pb(s[j]);
    }
    
    int cur = 0;
    
    for (int j = n; j < 2 * n; ++j) {
      auto it = find(all(vec), ('B' ^ 'W' ^ s[j]));
      cur += (vec.end() - it - 1);
      vec.erase(it);
    }
  
    ans = max(ans, cur);
    rotate(s, s + 1, s + 2 * n);
  }
  
  printf("%d\n", ans);
}

int main() {
  int tt = 1;
  
  while (tt--) {
    solve();
  }

  return 0;
}

Compilation message (stderr)

monochrome.cpp: In function 'void solve()':
monochrome.cpp:24:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
monochrome.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |   scanf("%s", s);
      |   ~~~~~^~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 21 / 21
• Subtask 3: 10 / 10
• Subtask 4: 0 / 65