Submission #5494621

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Source Code Expand

#include<cstdio>
#include<stack>
#include<algorithm>
#include<vector>
using namespace std;
stack<int> st;
int ch[100010];
vector<pair<int,int>> vt[4];
int main()
{
	int n, m, k;
	scanf("%d %d %d", &n, &m, &k);
	for (int i = 1; i <= k; i++) {
		int q, w, e, r;
		scanf("%d %d %d %d", &q, &w, &e, &r);
		if ((q == 0 || q == n || w == 0 || w == m) && (e == 0 || e == n || r == 0 || r == m)) {
			if (q == 0)
				vt[0].push_back({ w,i });
			else if (w == m)
				vt[1].push_back({ q,i });
			else if (q == n)
				vt[2].push_back({ w,i });
			else if (w == 0)
				vt[3].push_back({ q,i });
			if (e == 0)
				vt[0].push_back({ r,i });
			else if (r == m)
				vt[1].push_back({ e,i });
			else if (n == e)
				vt[2].push_back({ r,i });
			else if (r == 0)
				vt[3].push_back({ e,i });
		}
	}
	for (int i = 0; i < 4; i++) 
		sort(vt[i].begin(), vt[i].end());
	for (int i = 2; i < 4; i++)
		reverse(vt[i].begin(), vt[i].end());
	for (int i = 0; i < 4; i++) {
		for (int y = 0; y < vt[i].size(); y++) {
			int next = vt[i][y].second;
			ch[next]++;
			if (ch[next] == 1)
				st.push(next);
			else {
				if (st.top() != next) {
					puts("NO");
					return 0;
				}
				else st.pop();
			}
		}
	}
	puts("YES");
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:12:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &m, &k);
                               ^
./Main.cpp:15:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d %d", &q, &w, &e, &r);
                                       ^

Judge Result