Submission #932665

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
932665	2024-02-24 02:28:43	Programmer123	Fountain Parks (IOI21_parks)	C++17	55 / 100	2828 ms	85324 KiB

parks

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#include <bits/stdc++.h>
#include "parks.h"
std::unordered_map<int, int> map[200001];
int N;
std::vector<std::pair<int, int>> vld[200000];
std::pair<int, int> assigned[200000];
std::set<std::pair<int, int>> taken;
time_t stop;
std::default_random_engine Rand(std::random_device{}());
bool shuffle = false;
bool backtrack(int n) {
    if (n == N - 1) return true;
    if (clock() > stop) return false;
    if (shuffle && vld[n].size() == 2 && Rand() % 2) {
        std::swap(vld[n][0], vld[n][1]);
    }
    for (auto a: vld[n]) {
        if (taken.count(a)) continue;
        taken.insert(a);
        if (backtrack(n + 1)) {
            assigned[n] = a;
            return true;
        }
        taken.erase(a);
    }
    return false;
}
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 15
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20
• Subtask 6: 0 / 30