Submission #119579

#	Time	Username	Problem	Language	Result	Execution time	Memory
119579		Abelyan	Triangles (CEOI18_tri)	C++17	35 / 100	16 ms	384 KiB

tri

#include <bits/stdc++.h>
#include "trilib.h"
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
 
#define FOR(i,a) for (int i=0;i<(a);++i)
#define FORD(i,a) for (int i=(a)-1;i>=0;i--)
#define FORT(i,a,b) for (int i=(a);i<=(b);++i)
#define FORTD(i,b,a) for (int i=(b);i>=(a);--i)
#define trav(i,v) for (auto i : v)
#define all(v) v.begin(),v.end()
#define ad push_back
#define fr first
#define sc second
#define mpr(a,b) make_pair(a,b)
#define pir pair<int,int>
#define all(v) v.begin(),v.end()
#define make_unique(v) v.erase(unique(all(v),v.end()))
#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define dbg(x);
#define dbgv(v);
#define srng mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define y1 EsiHancagorcRepa
#ifdef ALEXPC
#define dbg(x); cout<<#x<<" = "<<x<<endl
#define dbgv(v); cout<<#v<<" = ["; trav(tv,v)cout<<"tv,";cout<<"]"<<endl
#endif
 
//const int N=100,M=N*N;
const ll MOD=1000*1000*1000+7;
 
const int N=1e5+6;
 
bool cl[N];
 
int main(){
    fastio;
    srng;
    int n=get_n(),ans=0;
    srand(12413);
    vector<int> v;
    FOR(i,n)v.ad(i);
    random_shuffle(all(v));
    FOR(i1,n){
        bool bl=false;
        if (cl[i1]){
            ans++;
            continue;
        }
        FOR(i2,n){
            if (i1==i2)continue;
            int tv=0;
            int qan=0;
            FOR(i,n){
                if (i==i1 || i==i2)continue;
                tv+=is_clockwise(v[i1]+1,v[i2]+1,v[i]+1);
                qan++;
                if (tv!=0 && tv!=qan){
                    tv=1;
                    break;
                }
            }
            if (tv==n-2 || tv==0){
                cl[i1]=true;
                cl[i2]=true;
                break;
            }
        }
        ans+=cl[i1];
    }
    give_answer(ans);
    return 0;
}

Compilation message (stderr)

tri.cpp: In function 'int main()':
tri.cpp:48:14: warning: unused variable 'bl' [-Wunused-variable]
         bool bl=false;
              ^~

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