Submission #685277

#	Time	Username	Problem	Language	Result	Execution time	Memory
685277		tudor	Table Tennis (info1cup20_tabletennis)	C++17	100 / 100	173 ms	4436 KiB

tabletennis

#include <iostream>

using namespace std;
const int nmax = 150000;
const int kmax = 400;

int a[nmax + kmax];
int n, k;

pair < int, int > ans[nmax / 2];

int check ( int sum ) {
    int st = 0, dr = n + k - 1, cnt = 0;
    while ( st < dr && cnt < n / 2 && ( dr - st + 1 ) / 2 + cnt >= n / 2 ) {
        if ( a[st] + a[dr] == sum )
            ans[cnt++] = { st++, dr-- };
        else if ( a[st] + a[dr] < sum )
            st++;
        else dr--;
    }
    return cnt >= n / 2;
}


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

    for ( int i = 0; i < n + k; i++ )
        cin >> a[i];

    bool ok = false;
    for ( int i = 0; i <= k && !ok; i++ )
        for ( int j = n - 1; j < n + k && !ok; j++ )
            if ( i < j && check ( a[i] + a[j] ) )
                ok = true;

    for ( int i = 0; i < n / 2; i++ )
        cout << a[ans[i].first] << ' ';
    for ( int i = n / 2 - 1; i >= 0; i-- )
        cout << a[ans[i].second] << ' ';


    return 0;
}

• 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