Submission #1178680

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Source Code Expand

#include<bits/stdc++.h>
#define N 400005
#define LL long long
using namespace std;
int n,m,a[N],f[N]; LL ans;
struct edge{
	int x,y,z;
	edge(int _x=0,int _y=0,int _z=0){ x=_x,y=_y,z=_z;}
}G[N];
int find(int x){ return f[x] ? f[x]=find(f[x]) : x;}
bool cmp(edge p,edge q){ return p.z<q.z;}
int main()
{
	int i,fx,fy;
	scanf("%d %d",&n,&m);
	memset(a,127,sizeof(a));
	for(i=1;i<=m;i++){
		scanf("%d %d %d",&G[i].x,&G[i].y,&G[i].z);
		G[i].x++,G[i].y++;
		a[G[i].x]=min(a[G[i].x],G[i].z+1);
		a[G[i].y]=min(a[G[i].y],G[i].z+2);
	  }
	for(i=2;i<=2*n;i++)
		a[i]=min(a[i],a[i-1]+2);
	for(i=1;i<=n;i++)
		G[++m]=edge(i,i%n+1,min(a[i],a[i+n]));
	sort(G+1,G+m+1,cmp);
	for(i=1;i<=m;i++){
		fx=find(G[i].x);
		fy=find(G[i].y);
		if(fx!=fy)
			f[fx]=fy,ans+=G[i].z;
	  }
	cout<<ans;
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:15:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
                      ^
./Main.cpp:18:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d",&G[i].x,&G[i].y,&G[i].z);
                                            ^

Judge Result