Submission #966149

#	Time	Username	Problem	Language	Result	Execution time	Memory
966149		vjudge1	Alternating Heights (CCO22_day1problem1)	C++17	0 / 25	260 ms	38276 KiB

Main

#include <bits/stdc++.h>

using namespace std;

int n, k, q, arr[3010], dp[3010][3010], x, y;
set<pair<int, int>> odd, even;
pair<int, int> temp;

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> k >> q;
    for(int i=1; i<=n; i++) {
        cin >> arr[i];
    }
    for(int i=1; i<=n; i++) {
        even.clear();
        odd.clear();
        for(int j=i+1; j<=n; j++) {
            temp = make_pair(min(arr[j-1], arr[j]), max(arr[j-1], arr[j]));
            if(j%2 == 0) {
                if(odd.count(temp) == 0 && arr[j-1] != arr[j]) {
                    dp[i][j] = 1;
                    if(even.count(temp) == 0) {
                        even.insert(temp);
                    }
                } else {
                    break;
                }
            } else {
                if(even.count(temp) == 0 && arr[j-1] != arr[j]) {
                    dp[i][j] = 1;
                    if(odd.count(temp) == 0) {
                        odd.insert(temp);
                    }
                } else {
                    break;
                }
            }
        }
    }
    while(q--) {
        cin >> x >> y;
        if(x == y || dp[x][y]) {
            cout << "YES\n";
        } else {
            cout << "NO\n";
        }
    }
    return 0;
}

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