Submission #1132473

#	Time	Username	Problem	Language	Result	Execution time	Memory
1132473		antonn	Gift Exchange (JOI24_ho_t4)	C++20	14 / 100	2593 ms	6976 KiB

Main

#include <bits/stdc++.h>

#define F first
#define S second

using namespace std;
using ll = long long;
using pi = pair<int, int>;
using vi = vector<int>;

template<class T> bool ckmin(T& a, T b) { return b < a ? a = b, true : false; }
template<class T> bool ckmax(T& a, T b) { return a < b ? a = b, true : false; }

int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    
    int n; cin >> n;
    vector<int> a(n + 1), b(n + 1);
    for (int i = 1; i <= n; ++i) cin >> a[i];
    for (int i = 1; i <= n; ++i) cin >> b[i];
    
    vector<int> sol(n + 1);
    
    int q; cin >> q;
    while (q--) {
        int l, r; cin >> l >> r;
        vector<pair<int, int>> v;
        set<pair<int, int>> s;
        for (int i = l; i <= r; ++i) v.push_back({a[i], i});
        for (int i = l; i <= r; ++i) s.insert({b[i], i});
        sort(v.begin(), v.end());
        
        int cnt = 0;
        bool ok = 1;
        int who1 = -1, who2 = -1;
        for (auto [x, i] : v) {
            bool still = 0;
            if (s.count({b[i], i})) still = 1, s.erase({b[i], i});
            auto it = s.lower_bound({x + 1, 0});
            if (it == s.begin()) {
                cnt++;
                if (cnt == 3) {
                    ok = false;
                    break;
                }
                if (who1 != -1) who2 = i;
                if (who1 == -1) who1 = i;
                sol[i] = a[i];
                continue;
            } 
            sol[prev(it)->second] = x;
            s.erase(prev(it));
            if (still == 1) s.insert({b[i], i});
        }
        if (cnt == 2) {
            ok = 0;
            if (sol[who1] >= b[who2] && sol[who2] >= b[who1]) ok = 1;
        }
        if (cnt == 1) {
            ok = 0;
            for (int i = l; i <= r; ++i) {
                if (i != who1 && sol[i] >= b[who1] && sol[who1] >= b[i]) ok = 1;
            }
        }
        cout << (ok ? "Yes" : "No") << "\n";
    }
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 5
• Subtask 3: 10 / 10
• Subtask 4: 0 / 31
• Subtask 5: 0 / 8
• Subtask 6: 0 / 12
• Subtask 7: 0 / 18
• Subtask 8: 0 / 12