oj.uz

Submission #723845

# Submission time Handle Problem Language Result Execution time Memory
723845 2023-04-14T10:59:42 Z OttincaM Hacker (BOI15_hac) C++17
0 / 100
 1 ms 212 KB 
#include <iostream>
#include <vector>
#include "stdio.h"
#pragma GCC optimize("Ofast,O3,unroll-loops")

using namespace std;

signed main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    #ifdef WTF
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
        freopen("error.txt", "w", stderr);
    #endif
 
    int n; cin >> n;
    vector <int> a(n + 1);
    for(int i = 1; i <= n; i ++){
        cin >> a[i];
    }

    vector <int> pr(n + 1, 0), sf(n + 2, 0);
    for(int i = 1; i <= n; i ++){
        pr[i] = pr[i - 1] + a[i];
    }  
    for(int i = n; i >= 1; i --){
        sf[i] = sf[i + 1] + a[i];
    }

    int ans = 0;
    for(int i = 1; i <= n; i ++){
        int rg = 0, lf = 0;
        int cnt = n / 2;
        if(i + cnt <= n) rg = pr[i + cnt] - pr[i];
        else {
            rg = pr[n] - pr[i];
            rg += pr[cnt - (n - i)];
        }
        if(i - cnt >= 1) lf = sf[i - cnt] - sf[i];
        else{
            lf = sf[1] - sf[i];
            lf += sf[n - (cnt - (i - 1)) + 1];
        }
        ans = max(ans, pr[n] - max(lf, rg));
    }
    cout << ans << "\n";
    return 0;
}

Subtask #1
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -