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Submission #277044

# Submission time Handle Problem Language Result Execution time Memory
277044 2020-08-21T01:59:19 Z tinjyu Duathlon (APIO18_duathlon) C++14
0 / 100
 1000 ms 1048580 KB 
#include <iostream>
using namespace std;
long long int son[100005],ans,cnt,tmp[100005],n,m,road[100005],map[300005][2];
void dfs(int x,int fa)
{
	son[x]=1;
	long long int g=road[x];
	while(g!=-1)
	{
		long long int now=map[g][0];
		if(now!=fa)
		{
			dfs(now,x);
			son[x]+=son[now];
		}
		g=map[g][1];
	}
	return ;
}
void find(int x,int fa)
{
	cnt=0;
	long long int sum=0;
	long long int g=road[x];
	while(g!=-1)
	{
		long long int now=map[g][0];
		if(now!=fa)
		{
			ans+=(n-son[now]-1)*son[now];
		}
		g=map[g][1];
	}
	ans+=(n-son[x])*(son[x]-1);
	g=road[x];
	while(g!=-1)
	{
		long long int now=map[g][0];
		if(now!=fa)
		{
			find(now,x);
		}
		g=map[g][1];
	}
	return ;
}
int main(){
	cin>>n>>m;
	for(int i=1;i<=n;i++)road[i]=-1;
	for(int i=1;i<=m;i++)
	{
		int u,v;
		cin>>u>>v;
		map[i*2][0]=v;
		map[i*2][1]=road[u];
		road[u]=i*2;
		map[i*2+1][0]=i;
		map[i*2+1][1]=road[v];
		road[v]=i*2+1;
	}
	dfs(1,-1);
	find(1,-1);
	cout<<ans<<endl;
	return 0;
}

Compilation message

count_triplets.cpp: In function 'void find(int, int)':
count_triplets.cpp:23:16: warning: unused variable 'sum' [-Wunused-variable]
   23 |  long long int sum=0;
      |                ^~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 738 ms 1048580 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 738 ms 1048580 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1055 ms 1048576 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 678 ms 1048580 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Runtime error 1040 ms 1048580 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Runtime error 712 ms 1048580 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 1024 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 738 ms 1048580 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 738 ms 1048580 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -