Submission #1534253

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Source Code Expand

#include<bits/stdc++.h>
#define x first
#define p second
using namespace std;
typedef pair<int,int> point;

const int maxn = 100009;
vector<point> U, R, D, L;
int r, c, n, X1, X2, Y1, Y2;
int s[maxn], top;

void calc(int x){
	if (top && s[top] == x) top--;
	else s[++top] = x;
}

int main(){
	scanf("%d%d%d", &r, &c, &n);
	for (int i=1; i<=n; i++){
		scanf("%d%d%d%d", &X1, &Y1, &X2, &Y2);
		if (X1 != 0 && X1 != r && Y1 != 0 && Y1 != c) continue;
		if (X2 != 0 && X2 != r && Y2 != 0 && Y2 != c) continue;
		if (X1 == 0) U.push_back(make_pair(Y1, i));
		else if (Y1 == c) R.push_back(make_pair(X1, i));
		else if (X1 == r) D.push_back(make_pair(Y1, i));
		else L.push_back(make_pair(X1, i));
		if (X2 == 0) U.push_back(make_pair(Y2, i));
		else if (Y2 == c) R.push_back(make_pair(X2, i));
		else if (X2 == r) D.push_back(make_pair(Y2, i));
		else L.push_back(make_pair(X2, i));
	}
	sort(U.begin(), U.end()); sort(R.begin(), R.end());
	sort(D.begin(), D.end()); sort(L.begin(), L.end());
	for (int i=0; i<U.size(); i++) calc(U[i].p);
	for (int i=0; i<R.size(); i++) calc(R[i].p);
	for (int i=D.size()-1; i>=0; i--) calc(D[i].p);
	for (int i=L.size()-1; i>=0; i--) calc(L[i].p);
	puts(top == 0 ? "YES" : "NO");
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:18:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &r, &c, &n);
                             ^
./Main.cpp:20:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d", &X1, &Y1, &X2, &Y2);
                                        ^

Judge Result