Submission #2408180

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Source Code Expand

#include <bits/stdc++.h>
#define pb push_back
#define cmin(a,b) (a>b?a=b:a)
#define cmax(a,b) (a<b?a=b:a)
#define lop(i,s,t) for(int i=s;i<(t);++i)
#define rep(i,s,t) for(int i=s;i<=(t);++i)
#define dec(i,s,t) for(int i=s;i>=(t);--i)
#define fore(i,v) for(int i=g[v],d=es[i].d;i;i=es[i].nxt,d=es[i].d)
using namespace std;

#define Pr(f,...) //printf(f,##__VA_ARGS__),fflush(stdout)

typedef long long ll;

const int N=405,M=1e5+5; 

int n,m,x[M],y[M],fail[N],ans;
bitset<N> alive[N]; 

int main(int argc,char *argv[]){
#ifdef CURIOUSCAT
	//freopen("dat.in","r",stdin);
	//freopen("my.out","w",stdout);
#endif
	scanf("%d%d",&n,&m); 
	rep(i,1,m){
		scanf("%d%d",x+i,y+i); 
	}
	rep(i,1,n){
		bitset<N> &z=alive[i]; 
		z[i]=1;
		dec(j,m,1){
			if(z[x[j]]&&z[y[j]])fail[i]=1; 
			else if(z[x[j]]) z[y[j]]=1;
			else if(z[y[j]]) z[x[j]]=1;
		}
	}
	rep(i,1,n)if(!fail[i]){
		rep(j,i+1,n)if(!fail[j]){
			if(!(alive[i]&alive[j]).count())++ans;
		}
	}
	printf("%d\n", ans);
	return 0; 
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main(int, char**)’:
./Main.cpp:25:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m); 
                     ^
./Main.cpp:27:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",x+i,y+i); 
                        ^

Judge Result