제출 #1066012

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1066012		manhlinh1501	Bigger segments (IZhO19_segments)	C++17	37 / 100	74 ms	98896 KiB

segments

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
const int MAXN = 5e5 + 5;

int N;
int a[MAXN];

namespace subtask {
    const int MAXN = 3e3 + 5;

    int dp[MAXN][MAXN];
    i64 prefix[MAXN];

    void solution() {
        for(int i = 1; i <= N; i++) prefix[i] = prefix[i - 1] + a[i];
        memset(dp, -0x3f, sizeof dp);
        for(int i = 1; i <= N; i++) dp[i][1] = 1;
        for(int i = 1; i <= N; i++) {
            for(int z = 1; z <= i; z++) {
                for(int j = z; j <= i; j++) {
                    if(prefix[i] + prefix[z - 1] >= 2 * prefix[j - 1])
                        dp[i][j] = max(dp[i][j], dp[j - 1][z] + (i != j or j != z));
                    else break;
                }
            }
        }
        int ans = 0;
        for(int i = 1; i <= N; i++) ans = max(ans, dp[N][i]);
        cout << ans << "\n";
    }
}

namespace subtask3 {
    const int MAXN = 3e3 + 5;

    int dp[MAXN][MAXN];
    i64 prefix[MAXN];

    void solution() {
        for(int i = 1; i <= N; i++) prefix[i] = prefix[i - 1] + a[i];
        memset(dp, -0x3f, sizeof dp);
        for(int i = 1; i <= N; i++) dp[i][1] = 1;
        for(int i = 1; i <= N; i++) {
            int j = 1;
            for(int z = 1; z <= i; z++) {
                j = max(j, z);
                while(j < i and prefix[i] + prefix[z - 1] >= 2 * prefix[j]) j++;

                if(prefix[i] + prefix[z - 1] >= 2 * prefix[j - 1])
                    dp[i][j] = max(dp[i][j], dp[j - 1][z] + (i != j or j != z));
            }
        }
        int ans = 0;
        for(int i = 1; i <= N; i++) ans = max(ans, dp[N][i]);
        cout << ans << "\n";
    }
}
signed main() {
#define TASK "code"

    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> N;
    for(int i = 1; i <= N; i++) cin >> a[i];
    subtask3::solution();
    return (0 ^ 0);
}

/**
4
2 3 1 7
**/

/**
5
6 2 3 9 13
**/

/**
3
3 1 2
**/

컴파일 시 표준 에러 (stderr) 메시지

segments.cpp: In function 'int main()':
segments.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27