Submission #1865293

---

Source Code Expand

#include <cstdio>
#include <algorithm>
#define REP(i, n) for(int i = 0; i < (int)(n); ++i)
using namespace std;

typedef long long ll;

bool can1[200000+10];
bool can2[200000+10];

int main(void) {
  int n, nEdge;
  scanf("%d%d", &n, &nEdge);
  REP(i, nEdge) {
    int a, b;
    scanf("%d%d", &a, &b);
    --a;
    --b;
    if(a == 0) {
      can1[b] = true;
    }
    if(b == 0) {
      can1[a] = true;
    }
    if(a == n-1) {
      can2[b] = true;
    }
    if(b == n-1) {
      can2[a] = true;
    }
  }
  bool res = false;
  REP(i, n) {
    if(can1[i] && can2[i]) {
      res = true;
    }
  }
  puts(res ? "POSSIBLE" : "IMPOSSIBLE");
  
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:14:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &n, &nEdge);
                            ^
./Main.cpp:17:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &a, &b);
                          ^

Judge Result