Submission #1986241

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,b) for (int i = (a); i < (b); i++)
#define RFOR(i,b,a) for (int i = (b) - 1; i >= (a); i--)
#define ITER(it,a) for (__typeof(a.begin()) it = a.begin(); it != a.end(); it++)
#define FILL(a,value) memset(a, value, sizeof(a))

#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;

const double PI = acos(-1.0);
const int INF = 1000 * 1000 * 1000 + 7;
const LL LINF = INF * (LL) INF;

const int MAX = 1010;

VI g[MAX];
int IN[MAX];
int OUT[MAX];
bool U[MAX];

int L, R;

void no()
{
	cout<<"NO"<<endl;
	exit(0);
}

void dfs(int x)
{
	U[x] = true;

	if (x & 1)
	{
		if (IN[x] > OUT[x]) no();
		R += IN[x] - OUT[x];
	}
	else
	{
		if (OUT[x] > IN[x]) no();
		L += OUT[x] - IN[x];
	}

	FOR (i, 0, SZ(g[x]))
	{
		int to = g[x][i];
		if (U[to]) continue;
		dfs(to);
	}
}

int main()
{
	//freopen("in.txt", "r", stdin);
	//ios::sync_with_stdio(false); cin.tie(0);

	int n, m;
	scanf("%d%d", &n, &m);
	FOR (i, 0, n)
	{
		int a, b, c, d;
		scanf("%d%d%d%d", &a, &b, &c, &d);

		int x, y;
		if (d == 0) y = b * 2;
		else y = d * 2 + 1;

		if (c == 0) x = a * 2 + 1;
		else x = c * 2;

	//	cout<<x<<' '<<y<<endl;
	//	cout<<a<<' '<<b<<' '<<c<<' '<<d<<endl;

		g[x].PB(y);
		g[y].PB(x);
		OUT[x]++;
		IN[y]++;
	}

	int c1 = 0, c2 = 0;
	FOR (i, 0, MAX)
	{
		if (U[i]) continue;
		if (SZ(g[i]) == 0) continue;
		L = R = 0;

		dfs(i);

		c1++;
		if (L == 0) c2++;
	}
	//cout<<"*"<<endl;
	if (c2) no();
	cout<<"YES"<<endl;

}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:66:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
./Main.cpp:70:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d", &a, &b, &c, &d);
                                    ^

Judge Result