Submission #871922

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
871922	2023-11-11 21:22:06	tvladm2009	Event Hopping 2 (JOI21_event2)	C++17	8 / 100	41 ms	3036 KiB

event2

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#include <bits/stdc++.h>
 
using i64 = long long;
 
int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int n, k;
    std::cin >> n >> k;
    std::vector<int> l(n), r(n);
    for (int i = 0; i < n; i++) {
        std::cin >> l[i] >> r[i];
    }
    if (n <= 20) {
        std::vector<std::vector<int>> good; 
        for (int mask = 1; mask < (1 << n); mask++) {
            if (__builtin_popcount(mask) != k) {
                continue;
            }
            std::vector<std::pair<int, int>> v;
            for (int b = 0; b < n; b++) {
                if (mask & (1 << b)) {
                    v.push_back({l[b], r[b]});
                }
            }
            sort(v.begin(), v.end());
            bool ok = true;
            for (int i = 1; i < v.size(); i++) {
                if (v[i].first < v[i - 1].second) {
 
 
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Compilation message (stderr)

event2.cpp: In function 'int main()':
event2.cpp:29:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |             for (int i = 1; i < v.size(); i++) {
      |                             ~~^~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 1 / 1
• Subtask 3: 0 / 31
• Subtask 4: 0 / 61