提出 #47473311

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ソースコード 拡げる

#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=3e5+5;
int n,m,fa[N],len[N];
pair<int,int> find(int x)
{
	if(x==fa[x])return {x,0};
	pair<int,int> ret=find(fa[x]);
	int w=ret.second;
	fa[x]=ret.first,ret.second+=len[x],len[x]+=w;
	return ret;
}
signed main()
{
	scanf("%lld%lld",&n,&m);
	for(int i=1;i<=n;i++)fa[i]=i;
	for(int i=1;i<=m;i++)
	{
		int x,y,z,a,b;
		scanf("%lld%lld%lld",&x,&y,&z);
		a=find(x).first,b=find(y).first;
		if(a==b)
		{
			if(a==y&&len[x]!=z)continue;
			else if(a==x&&len[y]!=-z)continue;
			else if(a!=x&&a!=y&&len[x]-len[y]!=z)continue;
			else printf("%lld ",i);
		}
		else
		{
			printf("%lld ",i);
			fa[a]=b,len[a]=len[y]-len[x]+z;
		}
	}
	return 0;
}

提出情報

コンパイルエラー

Main.cpp: In function ‘int main()’:
Main.cpp:16:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   16 |         scanf("%lld%lld",&n,&m);
      |         ~~~~~^~~~~~~~~~~~~~~~~~
Main.cpp:21:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   21 |                 scanf("%lld%lld%lld",&x,&y,&z);
      |                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

ジャッジ結果