Submission #746554

#	Time	Username	Problem	Language	Result	Execution time	Memory
746554		amirhoseinfar1385	Triangles (CEOI18_tri)	C++17	55 / 100	1408 ms	1232 KiB

tri

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

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n=get_n();
	vector<int>unnow;
	if(is_clockwise(1,2,3)){
		unnow.push_back(1);
		unnow.push_back(2);
		unnow.push_back(3);
	}
	else{
		unnow.push_back(1);
		unnow.push_back(3);
		unnow.push_back(2);
	}
	for(int ind=4;ind<=n;ind++){
		int sz=unnow.size();
		vector<int>ted(sz+1);
		int f=0;
		int ff=unnow[1];
		//cout<<ind<<" "<<ff<<" "<<unnow.back()<<" "<<unnow[0]<<" "<<unnow.size()<<endl;
		if(is_clockwise(unnow.back(),unnow[0],ind)!=is_clockwise(unnow.back(),unnow[0],ff)){
			ted[sz-1]++;
			ted[0]++;
			f=1;
		}
		//cout<<ind<<endl;
		for(int i=0;i<sz-1;i++){
			ff=unnow[0];
			if(i==0){
				ff=unnow[2];
			}
			if(is_clockwise(unnow[i],unnow[i+1],ind)!=is_clockwise(unnow[i],unnow[i+1],ff)){
				ted[i]++;
				ted[i+1]++;
				f=1;
			}
		}
		if(f==0){
			continue;
		}
		vector<int>fake;
		int z=0;
		for(int i=0;i<sz;i++){
			if(ted[i]==2){
				continue;
			}
			if(ted[i]==0){
				fake.push_back(unnow[i]);
				continue;
			}
			fake.push_back(unnow[i]);
			if(z){
				continue;
			}
			if(i==sz-1||ted[i+1]!=0){
				z=1;
				fake.push_back(ind);
			}
		}
		swap(fake,unnow);
		fake.clear();
	}
	give_answer((int)unnow.size());
}

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 25