A_Dima_and_Continuous_Line.cpp

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
const long long mod = 1e9 + 7;
#define INF (1LL << 60)
#define inf (1 << 30)
#define all(x) (x).begin(), (x).end()

#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x << " "; _print(x); cerr << endl;
#else
#define debug(x)
#endif

void _print(ll t) { cerr << t; }
void _print(int t) { cerr << t; }
void _print(string t) { cerr << t; }
void _print(char t) { cerr << t; }
void _print(lld t) { cerr << t; }
void _print(double t) { cerr << t; }
void _print(ull t) { cerr << t; }

template <class T, class V> void _print(pair <T, V> p);
template <class T> void _print(vector <T> v);
template <class T> void _print(set <T> v);

template <class T, class V> void _print(map <T, V> v);
template <class T> void _print(multiset <T> v);

template <class T, class V> void _print(pair <T, V> p) {
    cerr << "{"; _print(p.first); cerr << ","; _print(p.second); cerr << "}";
}
template <class T> void _print(vector <T> v) {
    cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";
}
template <class T> void _print(set <T> v) {
    cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";
}
template <class T> void _print(multiset <T> v) {
    cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";
}
template <class T, class V> void _print(map <T, V> v) {
    cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";
}



void solve(){
    int n;
    cin >> n;
    vector<int> temp(n);
    for (int i = 0; i < n; i++) {
        cin >> temp[i];
    }
    for (int i = 0; i < n - 1; i++) {
        for (int j = i + 2; j < n - 1; j++) {
            int x1 = min(temp[i], temp[i+1]);
            int x2 = max(temp[i], temp[i+1]);
            int x3 = min(temp[j], temp[j+1]);
            int x4 = max(temp[j], temp[j+1]);
            if ((x1 < x3 && x3 < x2 && x2 < x4) || (x3 < x1 && x1 < x4 && x4 < x2)) {
                cout << "yes\n";
                return;
            }
        }
    }
    cout << "no\n";
    
}

int main() {
    #ifndef ONLINE_JUDGE
        freopen("Error.txt", "w", stderr);
    #endif

    int test=1;
    // cin>>test;
    while(test--){
         solve();
    }
    
    return 0;
}