Submission #8680576

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Source Code Expand

#include<bits/stdc++.h>
#define fo(i, x, y) for(int i = x, B = y; i <= B; i ++)
#define ff(i, x, y) for(int i = x, B = y; i <  B; i ++)
#define fd(i, x, y) for(int i = x, B = y; i >= B; i --)
#define ll long long
#define pp printf
#define hh pp("\n")
using namespace std;

const int N = 1e5 + 5;

int n, m, x, y, r[N], bz[N], st, en;
vector<int> e[N];
int dg(int x, int la) {
	ff(j, 0, e[x].size()) {
		int y = e[x][j];
		if(y == la || y == en) continue;
		if(y == st) return 1;
		if(!bz[y] && dg(y, x)) return 1;
	}
	return 0;
}

int main() {
	scanf("%d %d", &n, &m);
	fo(i, 1, m) {
		scanf("%d %d", &x, &y);
		r[x] ++, r[y] ++;
		e[x].push_back(y);
		e[y].push_back(x);
	}
	int mr = 0, cnt = 0;
	fo(i, 1, n) {
		if(r[i] & 1) {
			pp("No\n"); return 0;
		}
		mr = max(mr, r[i]);
		if(r[i] == 4) cnt ++;
	}
	if(mr < 4 || (mr == 4 && cnt < 2)) {
		pp("No\n"); return 0;
	}
	if(mr > 4 || (mr == 4 && cnt > 2)) {
		pp("Yes\n"); return 0;
	}
	fo(i, 1, n) if(r[i] == 4) en = st, st = i;
	pp("%s\n", dg(st, 0) ? "Yes" : "No");
}

Submission Info

Compile Error

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

Judge Result