Submission #2124307

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Source Code Expand

#include<cstdio>
#include<vector>
using namespace std;
const int maxn=100000,inf=0x3f3f3f3f;
struct edge{int to,len;};
vector<edge> g[maxn+10];
int n,a[maxn+10],ans,c[16],ccnt,f[1<<16],gg[1<<16],h[1<<16]; bool b[16];
int main(){
	scanf("%d",&n);
	for(int i=1;i<n;++i){
		int l,r,w; scanf("%d%d%d",&l,&r,&w);
		a[l+1]^=w; a[r+1]^=w;
	}
	for(int i=1;i<=n;++i) if(a[i])
		if(b[a[i]]) ++f[0],b[a[i]]=0; else b[a[i]]=1;
	for(int i=0;i<16;++i) if(b[i]) c[ccnt++]=i;
	for(int i=0;i<1<<ccnt;++i)
		for(int j=0;j<ccnt;++j) if(i>>j&1) gg[i]^=c[j],++h[i];
	for(int i=1;i<1<<ccnt;++i){
		f[i]=inf;
		for(int j=i;j;j=(j-1)&i) if(!gg[j]) f[i]=min(f[i],f[i^j]+h[j]-1);
	}
	printf("%d",f[(1<<ccnt)-1]);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:9:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:11:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int l,r,w; scanf("%d%d%d",&l,&r,&w);
                                      ^

Judge Result