제출 #1240184

#제출 시각아이디문제언어결과실행 시간메모리
1240184lopkusJOIOJI (JOI14_joioji)C++20
0 / 100
161 ms327680 KiB
#include <bits/stdc++.h> #define int int64_t signed main() { int n; std::cin >> n; std::vector<int> a(n + 1); for(int i = 1; i <= n; i++) { char x; std::cin >> x; if(x == 'J') { a[i] = 0; } else if(x == 'O') { a[i] = 1; } else { a[i] = 2; } } std::vector<std::vector<int>> pref(n + 2, std::vector<int>(4, 0)); for(int i = 1; i <= n; i++) { for(int j = 0; j < 3; j++) { pref[i][j] = pref[i - 1][j]; } pref[i][a[i]] += 1; } std::vector<std::vector<int>> next(n + 2, std::vector<int>(n + 2, n + 1)); for(int i = n; i >= 1; i--) { for(int j = 0; j < 3; j++) { next[i][j] = next[i + 1][j]; } next[i][a[i]] = i; } int ans = 0; for(int i = 1; i <= n; i++) { int now = 0; int cnt = pref[n][0] - pref[i - 1][0]; for(int j = 1; j < 3; j++) { int New = pref[n][j] - pref[i - 1][j]; if(New < cnt) { cnt = New; now = j; } } int j = next[i][now]; while(cnt-- && j <= n) { if(pref[j][0] - pref[i - 1][0] == pref[j][1] - pref[i - 1][1] && pref[j][0] - pref[i - 1][0] == pref[j][2] - pref[i - 1][2]) { ans = std::max(ans, j - i + 1); } j = next[j + 1][now]; } } std::cout << ans; }
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