Submission #227451

#	Time	Username	Problem	Language	Result	Execution time	Memory
227451		cgiosy	곡선 자르기 (KOI17_cut)	C++17	0 / 100	6 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=qx=sx, py=sy;
	vector<int> A;
	A.reserve(N/2+2);
	for(int i=N; i--;) {
		int x, y;
		if(i) cin>>x>>y;
		else x=sx, y=sy;
		if(!i || (y>0)!=(py>0)) {
			if((i ? y<0 : y>0) && qx!=x) {
				A.push_back(min(qx, x)*2);
				A.push_back(max(qx, x)*2+1);
			}
			qx=x;
		}
		px=x, py=y;
	}
	sort(begin(A), end(A));
	int a=0, b=0, c=0, p=0;
	for(int x:A) {
		if(x%2) a+=!--c, b+=!p, p=1;
		else 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