답안 #298132

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
298132 2020-09-12T12:28:17 Z eriksuenderhauf Monochrome Points (JOI20_monochrome) C++17
컴파일 오류
0 ms 0 KB
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 2e5 + 5;
int a[2*N];
ll dp[N];

ll solve(int n, int i) {
  //if (dp[i] != 0)
  //  return dp[i];
  int ptr[2] = {i+n, i+n}, cnt[4] = {0, 0, 0, 0};
  // auto next = [&](int& j) {
  //   j = j+1 < 2*n ? j+1 : j+1-2*n;
  // };
  #define next(x) x = x+1 < 2*n ? x+1 : x+1-2*n
  ll val = 0;
  for (int j = i, c = a[i]; j < i+n; c = a[++j]) {
    while (ptr[c] != i && a[ptr[c]] == c)
      cnt[c+2]++, next(ptr[c]);
    next(ptr[c]);
    val += min(cnt[c+2], cnt[c^1]) + cnt[c]++;
  }
  return dp[i] = val;
}

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int get(int l, int r) {
  return uniform_int_distribution<int>(l, r)(rng);
}

int ord[N];

int main() {
  ios_base::sync_with_stdio(false); cin.tie(0);
  auto cur_t = clock();
  int n; cin >> n;
  string s; cin >> s;
  for (int i = 0; i < 2*n; i++)
    a[i] = s[i] == 'B', ord[i] = i;
  shuffle(ord, ord+n, rng);
  ll ans = 0;
  while (clock() - cur_t < 1994000)
    ans = max(ans, solve(n, ord[i]));
  cout << ans << "\n";
}

Compilation message

monochrome.cpp: In function 'int main()':
monochrome.cpp:44:33: error: 'i' was not declared in this scope
   44 |     ans = max(ans, solve(n, ord[i]));
      |                                 ^