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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#239197#7689. Flipping Cardsucup-team1191#WA 1ms3452kbC++203.4kb2023-11-04 19:09:032023-11-04 19:09:03

Judging History

你现在查看的是最新测评结果

  • [2023-11-04 19:09:03]
  • 评测
  • 测评结果:WA
  • 用时:1ms
  • 内存:3452kb
  • [2023-11-04 19:09:03]
  • 提交

answer

/*
    author:  Maksim1744
    created: 04.11.2023 14:04:40
*/

#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

#define mp   make_pair
#define pb   push_back
#define eb   emplace_back

#define sum(a)     ( accumulate ((a).begin(), (a).end(), 0ll))
#define mine(a)    (*min_element((a).begin(), (a).end()))
#define maxe(a)    (*max_element((a).begin(), (a).end()))
#define mini(a)    ( min_element((a).begin(), (a).end()) - (a).begin())
#define maxi(a)    ( max_element((a).begin(), (a).end()) - (a).begin())
#define lowb(a, x) ( lower_bound((a).begin(), (a).end(), (x)) - (a).begin())
#define uppb(a, x) ( upper_bound((a).begin(), (a).end(), (x)) - (a).begin())

template<typename T>             vector<T>& operator--            (vector<T> &v){for (auto& i : v) --i;            return  v;}
template<typename T>             vector<T>& operator++            (vector<T> &v){for (auto& i : v) ++i;            return  v;}
template<typename T>             istream& operator>>(istream& is,  vector<T> &v){for (auto& i : v) is >> i;        return is;}
template<typename T>             ostream& operator<<(ostream& os,  vector<T>  v){for (auto& i : v) os << i << ' '; return os;}
template<typename T, typename U> pair<T,U>& operator--           (pair<T, U> &p){--p.first; --p.second;            return  p;}
template<typename T, typename U> pair<T,U>& operator++           (pair<T, U> &p){++p.first; ++p.second;            return  p;}
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U> &p){is >> p.first >> p.second;        return is;}
template<typename T, typename U> ostream& operator<<(ostream& os, pair<T, U>  p){os << p.first << ' ' << p.second; return os;}
template<typename T, typename U> pair<T,U> operator-(pair<T,U> a, pair<T,U> b){return mp(a.first-b.first, a.second-b.second);}
template<typename T, typename U> pair<T,U> operator+(pair<T,U> a, pair<T,U> b){return mp(a.first+b.first, a.second+b.second);}
template<typename T, typename U> void umin(T& a, U b){if (a > b) a = b;}
template<typename T, typename U> void umax(T& a, U b){if (a < b) a = b;}

#ifdef HOME
#define SHOW_COLORS
#include "/mnt/c/Libs/tools/print.cpp"
#else
#define show(...) void(0)
#define debugf(fun)   fun
#define debugv(var)   var
#define mclock    void(0)
#define shows     void(0)
#define debug  if (false)
#define OSTREAM(...)    ;
#define OSTREAM0(...)   ;
#endif

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);

    int n;
    cin >> n;
    vector<int> x;
    vector<pair<int, int>> v(n);
    cin >> v;
    for (auto [a, b] : v) {
        x.pb(a);
        x.pb(b);
    }
    sort(x.begin(), x.end());
    x.erase(unique(x.begin(), x.end()), x.end());

    int l = -1, r = x.size();
    while (r - l > 1) {
        int c = (l + r) / 2;
        int min_pref = 0;
        int cur_pref = 0;
        int best_dif = 0;
        int tot_ones = 0;
        for (auto [a, b] : v) {
            a = (a >= x[c]);
            b = (b >= x[c]);
            tot_ones += a;
            int cur = b - a;
            cur_pref += cur;
            min_pref = min(min_pref, cur);
            best_dif = max(best_dif, cur_pref - min_pref);
        }
        if (tot_ones + best_dif >= n / 2 + 1) {
            l = c;
        } else {
            r = c;
        }
    }
    cout << x[l] << '\n';

    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3412kb

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: 3448kb

input:

1
2 1

output:

2

result:

ok 1 number(s): "2"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3412kb

input:

1
212055293 384338286

output:

384338286

result:

ok 1 number(s): "384338286"

Test #4:

score: -100
Wrong Answer
time: 0ms
memory: 3452kb

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:

512721865

result:

wrong answer 1st numbers differ - expected: '528957505', found: '512721865'