Submission #812672

#	Time	Username	Problem	Language	Result	Execution time	Memory
812672		DJeniUp	Triangles (CEOI18_tri)	C++17	0 / 100	1 ms	212 KiB

tri

#include "trilib.h"
#include "bits/stdc++.h"

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll>pairll;
typedef pair<ll,ull>pairull;
typedef pair<ll,pairll>pair3l;
typedef long double ld;
typedef pair<ld,ld>pairld;

typedef pair<string,ll>pairsl;

#define fr first
#define sc second
#define pb push_back
#define endl '\n'
#define N 100007
#define MOD 1000000007
#define INF 10000000000007
#define eps 0.00000000001
#define A 50
#define PI 3.14159265359

ll n,d[40007];

vector<pairll>v,a;

void S(ll l,ll r,ll z){
    if(is_clockwise(v[l].fr,z,v[l].sc)==0 && is_clockwise(v[r].fr,z,v[r].sc)==0 && is_clockwise(v[l].fr,z,v[r].sc)==0)return ;
    if(l==r){
        d[l]=z;
    }
}

int main(){
    n=get_n();
    ll x=is_clockwise(1,3,2);
    if(x==1){
        v.pb({1,3});
        v.pb({3,2});
        v.pb({2,3});
    }else{
        v.pb({1,2});
        v.pb({2,3});
        v.pb({3,1});
    }
    for(int i=4;i<=n;i++){
        for(int j=0;j<v.size();j++){
            d[j]=is_clockwise(v[j].fr,i,v[j].sc);
        }
        a.clear();
        for(int j=0;j<v.size();j++){
            if(d[j]==1 && d[(j-1+v.size())%v.size()]==0){
                a.pb({v[j].fr,i});
            }

            if(d[j]==1 && d[(j+1)%v.size()]==0){
                a.pb({i,v[j].sc});
            }
            if(d[j]==0){
                a.pb(v[j]);
            }
        }
        swap(v,a);
    }
    give_answer(v.size());
    return 0;
}

Compilation message (stderr)

tri.cpp: In function 'int main()':
tri.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |         for(int j=0;j<v.size();j++){
      |                     ~^~~~~~~~~
tri.cpp:55:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for(int j=0;j<v.size();j++){
      |                     ~^~~~~~~~~

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