제출 #1274741

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1274741		baotoan655	JJOOII 2 (JOI20_ho_t2)	C++20	100 / 100	12 ms	7488 KiB

ho_t2

#include <bits/stdc++.h>
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
using namespace std;

const int N = 2e5 + 5;
int n, k;
int con(char x) {
    if(x == 'J') return 0;
    else if(x == 'O') return 1;
    return 2;
}
int pref[3][N];
int best[3][N];
int dp[N][3];

void cal(int pr[], int *bst) {
     int j = 1;
     for(int i = 1; i <= n; ++i) {
        while(j < i && pr[i] - pr[j] >= k) ++j;
        if(pr[i] - pr[j - 1] >= k) bst[i] = j;
     }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    file("A") else file("task");
    cin >> n >> k;
    for(int i = 1; i <= n; ++i) {
        for(int j = 0; j < 3; ++j) pref[j][i] = pref[j][i - 1];
        char x;
        cin >> x;
        int c = con(x);
        pref[c][i]++;
    }
    memset(best, -0x3f, sizeof best);
    for(int c = 0; c < 3; ++c) cal(pref[c], best[c]);
    memset(dp, -0x3f, sizeof dp);
    for(int i = 1; i <= n; ++i) if(best[0][i] >= 1) dp[i][0] = best[0][i];
    for(int j = 1; j < 3; ++j) {
        for(int i = 1; i <= n; ++i) if(best[j][i] >= 1) dp[i][j] = dp[best[j][i] - 1][j - 1];
        for(int i = 1; i <= n; ++i) dp[i][j] = max(dp[i][j], dp[i - 1][j]);
    }
//    cout << best[1][7] << '\n';
//    cout << dp[7][1] << '\n';
    int ans = n + 1;
    for(int i = 1; i <= n; ++i) ans = min(ans, i - dp[i][2] + 1 - 3 * k);
    if(ans > n) ans = -1;
    cout << ans << '\n';
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
ho_t2.cpp:28:5: note: in expansion of macro 'file'
   28 |     file("A") else file("task");
      |     ^~~~
ho_t2.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
ho_t2.cpp:28:5: note: in expansion of macro 'file'
   28 |     file("A") else file("task");
      |     ^~~~
ho_t2.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
ho_t2.cpp:28:20: note: in expansion of macro 'file'
   28 |     file("A") else file("task");
      |                    ^~~~
ho_t2.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
ho_t2.cpp:28:20: note: in expansion of macro 'file'
   28 |     file("A") else file("task");
      |                    ^~~~

• Subtask 1: 1 / 1
• Subtask 2: 12 / 12
• Subtask 3: 87 / 87