Submission #991612

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Source Code Expand

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <cassert>
#include <iostream>
#include <sstream>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <utility>
#include <numeric>
#include <algorithm>
#include <bitset>
#include <complex>
#include <array>
#include <list>
#include <stack>
#include <valarray>

using namespace std;

typedef unsigned uint;
typedef long long Int;
typedef unsigned long long UInt;

const int INF = 1001001001;
const Int INFLL = 1001001001001001001LL;

template<typename T> void pv(T a, T b) { for (T i = a; i != b; ++i) cout << *i << " "; cout << endl; }
template<typename T> void chmin(T& a, T b) { if (a > b) a = b; }
template<typename T> void chmax(T& a, T b) { if (a < b) a = b; }
int in() { int x; scanf("%d", &x); return x; }
double fin() { double x; scanf("%lf", &x); return x; }
Int lin() { Int x; scanf("%lld", &x); return x; }

int U[100050];

void init(int n) {
  for (int i = 0; i < n; ++i) {
    U[i] = i;
  }
}

int find(int x) {
  return U[x] == x ? x : U[x] = find(U[x]);
}

void uni(int x, int y) {
  U[find(x)] = find(y);
}

vector<int> A[100050];

int main() {
  int N = in();
  int M = in();
  for (int i = 0; i < N; ++i) {
    int K = in();
    for (int j = 0; j < K; ++j) {
      int L = in() - 1;
      A[L].push_back(i);
    }
  }

  init(N);
  for (int i = 0; i < M; ++i) {
    for (int j = 0; j + 1 < A[i].size(); ++j) {
      uni(A[i][j], A[i][j + 1]);
    }
  }

  bool ok = true;
  for (int i = 0; i < N; ++i) {
    ok &= find(i) == find(0);
  }

  puts(ok ? "YES" : "NO");
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int in()’:
./Main.cpp:34:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 int in() { int x; scanf("%d", &x); return x; }
                                  ^
./Main.cpp: In function ‘double fin()’:
./Main.cpp:35:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 double fin() { double x; scanf("%lf", &x); return x; }
                                          ^
./Main.cpp: In function ‘Int lin()’:
./Main.cpp:36:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 Int lin() { Int x; scanf("%lld", &x); return x; }
                                     ^

Judge Result