Submission #991824

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef int _loop_int;
#define REP(i,n) for(_loop_int i=0;i<(_loop_int)(n);++i)
#define FOR(i,a,b) for(_loop_int i=(_loop_int)(a);i<(_loop_int)(b);++i)
#define FORR(i,a,b) for(_loop_int i=(_loop_int)(b)-1;i>=(_loop_int)(a);--i)

#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define DEBUG_VEC(v) cout<<#v<<":";REP(i,v.size())cout<<" "<<v[i];cout<<endl
#define ALL(a) (a).begin(),(a).end()

#define CHMIN(a,b) a=min((a),(b))
#define CHMAX(a,b) a=max((a),(b))

// mod
const ll MOD = 1000000007ll;
#define FIX(a) ((a)%MOD+MOD)%MOD

// floating
typedef double Real;
const Real EPS = 1e-11;
#define EQ0(x) (abs(x)<EPS)
#define EQ(a,b) (abs(a-b)<EPS)
typedef complex<Real> P;

int data[125252];
int init(){
  REP(i,125252)data[i]=-1;
}
int root(int x){
  return data[x]<0?x:data[x]=root(data[x]);
}
void unite(int a,int b){
  a=root(a);b=root(b);
  if(a!=b){
    if(data[a]>data[b])swap(a,b);
    data[a] += data[b];
    data[b] = a;
  }
}
int size(int x){
  return -data[root(x)];
}

int n,m;
vi langs[125252];

int main(){
  init();
  scanf("%d%d",&n,&m);
  REP(i,n){
    int k;
    scanf("%d",&k);
    REP(j,k){
      int l;
      scanf("%d",&l);
      --l;
      langs[l].push_back(i);
    }
  }
  REP(i,m){
    REP(j,langs[i].size()-1){
      unite(langs[i][j],langs[i][j+1]);
    }
  }
  puts(size(0)==n?"YES":"NO");
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:58:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&n,&m);
                      ^
./Main.cpp:61:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&k);
                   ^
./Main.cpp:64:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d",&l);
                     ^

Judge Result