Submission #6071705


Source Code Expand

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#include <bits/stdc++.h>
using namespace std;
const int Maxn=105; 
int n,k,cnt;
struct edg
{
	int x,y;
}edge[Maxn*Maxn];
int main()
{
	scanf("%d%d",&n,&k);
	int ans=(n-2)*(n-1)/2;
	if(ans<k)
	{
		printf("-1");
		return 0;
	}
	for(int i=2;i<=n;i++)
		edge[++cnt]=(edg){1,i};
	k-=ans;
	for(int i=2;i<=n;i++)
		for(int j=i+1;j<=n;j++)
			if(k) edge[++cnt]=(edg){i,j},k++;
	printf("%d\n",cnt);
	for(int i=1;i<=cnt;i++)
		printf("%d %d\n",edge[i].x,edge[i].y);
	return 0;
}

Submission Info

Submission Time
Task E - Friendships
User sys
Language C++14 (GCC 5.4.1)
Score 500
Code Size 495 Byte
Status AC
Exec Time 2 ms
Memory 256 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:11:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&k);
                     ^

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