Submission #227431

#	Time	Username	Problem	Language	Result	Execution time	Memory
227431		cgiosy	곡선 자르기 (KOI17_cut)	C++17	0 / 100	4 ms	384 KiB

cut

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
constexpr int INF=0x3f3f3f3f;

int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	int N, sx, sy, px, py, qx=INF;
	cin>>N>>sx>>sy; px=sx, py=sy;
	vector<int> A;
	A.reserve(N/4+2);
	auto push=[&](int &s, int &e) {
		A.push_back(min(s, e)*2);
		A.push_back(max(s, e)*2+1);
		s=e=INF;
	};
	for(int i=1; i<N; i++) {
		int x, y;
		cin>>x>>y;
		if((y>0)!=(py>0)) {
			if(qx!=INF) push(qx, x);
			qx=x;
		}
		px=x, py=y;
	}
	if(qx!=INF) push(qx, sx);
	sort(begin(A), end(A));
	int a=0, b=0, c=0, p=0;
	for(int x:A) {
		if(x%2) b+=!p, p=1;
		else a+=!c++, p=0;
	}
	cout<<a<<' '<<b;
}

Compilation message (stderr)

cut.cpp: In function 'int main()':
cut.cpp:8:17: warning: variable 'px' set but not used [-Wunused-but-set-variable]
  int N, sx, sy, px, py, qx=INF;
                 ^~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 24
• Subtask 3: 0 / 65