Submission #444145

#	Time	Username	Problem	Language	Result	Execution time	Memory
444145		Haruto810198	Triangles (CEOI18_tri)	C++17	35 / 100	416 ms	292 KiB

tri

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

using namespace std;

#define int long long
#define double long double

#define FOR(i, l, r, d) for(int i=(l); i<=(r); i+=(d))
#define szof(x) ((int)(x).size())

#define vi vector<int>
#define pii pair<int, int>

#define F first
#define S second

#define pb push_back
#define eb emplace_back
#define mkp make_pair

const int INF = 2147483647;
const int LNF = INF*INF;
const int MOD = 1000000007;
const int mod = 998244353;

const int MAX = 40010;

int N;
bool is_CH[MAX];
int res;

void is_CH_edge(int u, int v){

    bool L=0, R=0;

    FOR(i, 1, N, 1){
        if(i==u or i==v) continue;
        bool ans = is_clockwise(u, v, i);
        if(ans == true){
            R = 1;
        }
        else{
            L = 1;
        }
    }

    if(L==0 or R==0){
        is_CH[u] = 1;
        is_CH[v] = 1;
    }

}

signed main(){

    //ios_base::sync_with_stdio(false);
    //cin.tie(0);
    //cout.tie(0);

    N = get_n();

    FOR(i, 1, N, 1){
        is_CH[MAX] = 0;
    }

    FOR(i, 1, N, 1){
        FOR(j, i+1, N, 1){
            is_CH_edge(i, j);
        }
    }

    res = 0;
    FOR(i, 1, N, 1){
        res += is_CH[i];
    }

    give_answer(res);

    return 0;

}

Compilation message (stderr)

tri.cpp: In function 'int main()':
tri.cpp:64:18: warning: array subscript 40010 is above array bounds of 'bool [40010]' [-Warray-bounds]
   64 |         is_CH[MAX] = 0;
      |         ~~~~~~~~~^
tri.cpp:30:6: note: while referencing 'is_CH'
   30 | bool is_CH[MAX];
      |      ^~~~~

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