Submission #1306770

#	Time	Username	Problem	Language	Result	Execution time	Memory
1306770		hssaan_arif	Alternating Heights (CCO22_day1problem1)	C++20	0 / 25	1063 ms	62692 KiB

Main

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

#define endl "\n"
#define pb push_back
#define int long long
#define fi first
#define se second

const int N = 3e5 + 5, M = 1e9 + 7, LG = 20;

int n , A[N] , k , q , l , r;
map<pair<int,int> , int> mp , ch , pr;

void solve(){
    cin >> n >> k >> q;

    for (int i=1 ; i<=n ; i++){
        cin >> A[i];
    }

    while(q--){
        cin >> l >> r;

        if (pr[{l,r}]){
            if (mp[{l,r}] == 1){
                cout << "YES" << endl;
            }else{
                cout << "NO" << endl;
            }
        }else{
            for (int i=l ; i<r ; i++){
                if (A[i] == A[i+1]){
                    pr[{l,r}] = 2;
                    break;
                }
                if ((i-l+1)&1){
                    if (mp[{A[i],A[i+1]}]){
                        pr[{l,r}] = 2;
                        break;
                    }

                    ch[{A[i],A[i+1]}] = 1;
                }else{
                    if (ch[{A[i],A[i+1]}]){
                        pr[{l,r}] = 2;
                        break;
                    }

                    mp[{A[i],A[i+1]}] = 1;
                }
            }

            if (pr[{l,r}] == 2){
                cout << "NO" << endl;
            }else{
                pr[{l,r}] = 1;
                cout << "YES" << endl;
            }
        }
    }

}

signed main(){
    // freopen("" , "r" , stdin);
    // freopen("" , "w" , stdout);
    // cout << setprecision(30);
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int ts = 1;
    // cin >> ts;
    while(ts--){
        solve();
    }
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 8