Submission #1283005

#	Time	Username	Problem	Language	Result	Execution time	Memory
1283005		anhphant	Art Exhibition (JOI18_art)	C++20	100 / 100	155 ms	16076 KiB

art

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define fi first
#define se second
ll N;
pair<ll, ll> A[500007];

int main() {
    ios_base :: sync_with_stdio(0);
    cin.tie(0); cout.tie(0); cerr.tie(0);
    if (fopen("test.inp", "r")) {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }

    cin >> N;
    for(int i = 1; i <= N; ++i) {
        cin >> A[i].fi >> A[i].se;
    }
    sort(A + 1, A + 1 + N);

    vector<ll> diff(N + 7, 0LL);
    diff[1] = A[1].se - A[1].fi;
    for(int i = 2; i <= N; ++i) {
        diff[i] = (A[i].se + A[i - 1].se - A[i].fi) - (A[i - 1].se - A[i - 1].fi);
    }

    vector<ll> minSufDiff(N + 7, 0LL);
    ll curMin = 0, curSum = 0;
    for(int i = N; i >= 1; --i) {
        curSum += diff[i];
        curMin = min(curMin, curSum);
        minSufDiff[i] = curSum - curMin;
    }

    ll ans = 0;
    for(int i = 1; i <= N; ++i) {
        ans = max(ans, A[i].se + minSufDiff[i + 1]);
    }

    cout << ans;
}

Compilation message (stderr)

art.cpp: In function 'int main()':
art.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
art.cpp:14:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 50 / 50