Submission #717432

#	Time	Username	Problem	Language	Result	Execution time	Memory
717432		vjudge1	Table Tennis (info1cup20_tabletennis)	C++17	49 / 100	3103 ms	491684 KiB

tabletennis

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

#define int long long

const int mxN = 2e5 + 7;

const long long rand_max = 1e18;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
long long x_rand(long long i) {
    return uniform_int_distribution<long long>(0, rand_max)(rng) % i;
}

int arr[mxN];

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    auto rand = [&](long long a, long long b) {
        return a + x_rand(rand_max) % (b - a + 1);
    };

    int n, k;
    cin >> n >> k;

    bitset<2000000001> in, bad;
    for (int i = 0; i < n + k; ++i) {
        cin >> arr[i];
        in[arr[i]] = true;
    }

    while (true) {
        int a = rand(0, n + k - 1), b = rand(0, n + k - 1);

        while (a == b) {
            b = rand(0, n + k - 1);
        }
        
        int sum = arr[a] + arr[b];
        if (bad[sum]) {
            continue;
        }

        vector<int> nums;
        for (int l = 0; l < n + k; ++l) {
            if (sum - arr[l] >= 0 && in[sum - arr[l]]) {
                nums.push_back(arr[l]);
            }
        }

        if (nums.size() >= n) {
            for (int l = 0; l < n; ++l) {
                cout << nums[l] << ' ';
            }
            cout << "\n";
            exit(0);
        }
        bad[sum] = true;
    }
    assert(false);
}
// 1 2 1 2 3

Compilation message (stderr)

tabletennis.cpp: In function 'int32_t main()':
tabletennis.cpp:51:25: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   51 |         if (nums.size() >= n) {
      |             ~~~~~~~~~~~~^~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 9
• Subtask 3: 0 / 14
• Subtask 4: 15 / 15
• Subtask 5: 9 / 9
• Subtask 6: 14 / 14
• Subtask 7: 0 / 15
• Subtask 8: 0 / 13