Submission #791084

#	Time	Username	Problem	Language	Result	Execution time	Memory
791084		Andrey	Table Tennis (info1cup20_tabletennis)	C++14	100 / 100	176 ms	4568 KiB

tabletennis

#include <bits/stdc++.h>
using namespace std;

int n,k;
vector<int> ans(0);
vector<int> haha(0);

bool check(int a) {
    ans.clear();
    int l = 0,r = n+k-1;
    while(l < r) {
        if(r-l+1+ans.size() < n) {
            return false;
        }
        while(r > l && haha[l]+haha[r] > a) {
            r--;
        }
        if(r <= l) {
            return false;
        }
        if(haha[r]+haha[l] == a) {
            ans.push_back(haha[l]);
            ans.push_back(haha[r]);
            if(ans.size() == n) {
                return true;
            }
        }
        l++;
    }
    return false;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> k;
    int a;
    for(int i = 0; i < n+k; i++) {
        cin >> a;
        haha.push_back(a);
    }
    for(int i = 0; i < k+1; i++) {
        for(int j = n+k-1; j >= n-1 && j > i; j--) {
            if(check(haha[i]+haha[j])) {
                sort(ans.begin(),ans.end());
                for(int y = 0; y < n; y++) {
                    cout << ans[y] << " ";
                }
                cout << endl;
                return 0;
            }
        }
    }
    return 0;
}

Compilation message (stderr)

tabletennis.cpp: In function 'bool check(int)':
tabletennis.cpp:12:29: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   12 |         if(r-l+1+ans.size() < n) {
      |            ~~~~~~~~~~~~~~~~~^~~
tabletennis.cpp:24:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |             if(ans.size() == n) {
      |                ~~~~~~~~~~~^~~~

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