Submission #667637

#	Time	Username	Problem	Language	Result	Execution time	Memory
667637		pedroslrey	Table Tennis (info1cup20_tabletennis)	C++17	0 / 100	249 ms	31336 KiB

tabletennis

#include <bits/stdc++.h>

using namespace std;

map<int, int> vals;

bool test(vector<int> &xs, int n, int k, int x) {
    vector<int> marc(n + k);
    vector<pair<int, int>> pairs;
    for (int i = 0; i < n + k; ++i)
        if (!marc[i+1] && vals[x - xs[i]] != 0) {
            pairs.emplace_back(xs[i], x - xs[i]);
            marc[vals[x - xs[i]]] = true;
        }

    if (pairs.size() >= n/2) {
        for (int i = 0; i < n/2; ++i)
            cout << pairs[i].first << " " << pairs[i].second << " ";
        cout << "\n";
        return true;
    }
    return false;
}

int main() {
    int n, k;
    cin >> n >> k;

    vector<int> xs(n+k);
    for (int &x: xs)
        cin >> x;

    for (int i = 0; i < n + k; ++i)
        vals[xs[i]] = i + 1;

    for (int i = 0; i < k; ++i)
        for (int j = n + i; j < n + k; ++j)
            if (test(xs, n, k, xs[i] + xs[j])) return 0;
}

Compilation message (stderr)

tabletennis.cpp: In function 'bool test(std::vector<int>&, int, int, int)':
tabletennis.cpp:16:22: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   16 |     if (pairs.size() >= n/2) {
      |         ~~~~~~~~~~~~~^~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 9
• Subtask 3: 0 / 14
• Subtask 4: 0 / 15
• Subtask 5: 0 / 9
• Subtask 6: 0 / 14
• Subtask 7: 0 / 15
• Subtask 8: 0 / 13