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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#279437#7689. Flipping CardsabcjjtWA 0ms3852kbC++141.3kb2023-12-08 18:29:542023-12-08 18:29:54

Judging History

This is the latest submission verdict.

  • [2023-12-08 18:29:54]
  • Judged
  • Verdict: WA
  • Time: 0ms
  • Memory: 3852kb
  • [2023-12-08 18:29:54]
  • Submitted

answer

//
// Created by abc on 23-12-6.
//
#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
    int n; cin >> n;
    using P = pair<int, int>;
    vector<P> a(n + 1);
    for (int i = 1; i <= n; i++) {
        cin >> a[i].first >> a[i].second;
    }
    auto c = a;
    sort(c.begin() + 1, c.end());
    int left = c[(n + 1) / 2].first, right = 1e10;
    auto check = [&](int mid) -> bool {
        if (mid <= c[(n + 1) / 2].first) return true;
        vector<int> b(n + 1, 0);
        int ans = 0;
        for (int i = 1; i <= n; i++) {
            if (a[i].first >= mid and a[i].second < mid) b[i] = -1;
            else if (a[i].first < mid and a[i].second >= mid) b[i] = 1;
            else if (a[i].first >= mid and a[i].second >= mid) ans++;
            else if (a[i].first < mid and a[i].second < mid) ans--;
        }
        int res = 0;
        for (int i = 1, cnt = 0; i <= n; i++) {
            cnt = max(0ll, cnt + b[i]);
            res = max(res, cnt);
        }
//        cout << ans + res << "\n";
        return ans + res >= (n & 1);
    };
//    cout << check(2);
    while (left <= right) {
        int mid = left + right >> 1;
        if (check(mid)) left = mid + 1;
        else right = mid - 1;
    }
    cout << right << "\n";
    return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3604kb

input:

5
3 6
5 2
4 7
6 4
2 8

output:

6

result:

ok 1 number(s): "6"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3852kb

input:

1
2 1

output:

2

result:

ok 1 number(s): "2"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3608kb

input:

1
212055293 384338286

output:

384338286

result:

ok 1 number(s): "384338286"

Test #4:

score: -100
Wrong Answer
time: 0ms
memory: 3812kb

input:

99
749159996 323524232
125448341 365892333
481980673 143665393
394405973 44741918
687549448 513811513
287088118 385131171
11865696 666468353
449920567 373650719
671547289 116780561
41003675 671513243
351534153 507850962
374160874 985661954
222519431 600582098
987220654 704142246
856147059 37783620
1...

output:

481980673

result:

wrong answer 1st numbers differ - expected: '528957505', found: '481980673'