제출 #35976

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
35976		funcsr	Pipes (CEOI15_pipes)	C++14	0 / 100	3363 ms	65536 KiB

pipes

#include <bitset>
#include <cassert>
#include <vector>
#define rep(i, n) for (int i=0; i<(n); i++)
#define INF 1145141919
#define pb push_back

using namespace std;
int N, M;
vector<int> G[100000];

int R[100000];
int U[17][100000];
void dfs(int x, int p, int r) {
  R[x] = r;
  U[0][x] = p;
  for (int t : G[x]) {
    if (t == p) continue;
    dfs(t, x, r+1);
  }
}

signed main() {
  auto f = fopen("/dev/stdin", "r");
  fscanf(f, "%d %d", &N, &M);
  auto backward = new bitset<6000000>();
  rep(i, M) {
    int u, v;
    fscanf(f, "%d %d", &u, &v);
    u--, v--;
    G[u].pb(v);
    G[v].pb(u);
  }
  printf("1\n");
  return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp: In function 'int main()':
pipes.cpp:26:8: warning: unused variable 'backward' [-Wunused-variable]
   auto backward = new bitset<6000000>();
        ^~~~~~~~
pipes.cpp:25:9: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   fscanf(f, "%d %d", &N, &M);
   ~~~~~~^~~~~~~~~~~~~~~~~~~~
pipes.cpp:29:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf(f, "%d %d", &u, &v);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~

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