Submission #6063456


Source Code Expand

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pl = pair<ll, ll>;
int n,k;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> k;
    if(k > (n-1)*(n-2)/2)
    {
        cout << -1;
        return 0;
    }
    cout << n*(n-1)/2 - k << '\n';
    k = n*(n-1)/2 - k;
    for(int i=1;i<n;i++)
    {
        cout << i << ' ' << n << '\n';
        k--;
    }
    for(int i=1;i<n;i++)
    {
        for(int j=i+1;j<n;j++)
        {
            if(!k) return 0;
            cout << i << ' ' << j << '\n';
            k--;
        }
    }
}

Submission Info

Submission Time
Task E - Friendships
User evenharder
Language C++14 (GCC 5.4.1)
Score 500
Code Size 625 Byte
Status AC
Exec Time 2 ms
Memory 256 KB

Judge Result

Set Name All Sample
Score / Max Score 500 / 500 0 / 0
Status
AC × 18
AC × 2
Set Name Test Cases
All sample_01, sample_02, testcase_01, testcase_02, testcase_03, testcase_04, testcase_05, testcase_06, testcase_07, testcase_08, testcase_09, testcase_10, testcase_11, testcase_12, testcase_13, testcase_14, testcase_15, testcase_16
Sample sample_01, sample_02
Case Name Status Exec Time Memory
sample_01 AC 1 ms 256 KB
sample_02 AC 1 ms 256 KB
testcase_01 AC 1 ms 256 KB
testcase_02 AC 1 ms 256 KB
testcase_03 AC 1 ms 256 KB
testcase_04 AC 2 ms 256 KB
testcase_05 AC 1 ms 256 KB
testcase_06 AC 1 ms 256 KB
testcase_07 AC 1 ms 256 KB
testcase_08 AC 1 ms 256 KB
testcase_09 AC 1 ms 256 KB
testcase_10 AC 1 ms 256 KB
testcase_11 AC 1 ms 256 KB
testcase_12 AC 1 ms 256 KB
testcase_13 AC 1 ms 256 KB
testcase_14 AC 1 ms 256 KB
testcase_15 AC 2 ms 256 KB
testcase_16 AC 1 ms 256 KB