Submission #718293

#	Time	Username	Problem	Language	Result	Execution time	Memory
718293		haxorman	Table Tennis (info1cup20_tabletennis)	C++14	100 / 100	494 ms	288060 KiB

tabletennis

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

#define int long long

const int mxN = 2e5 + 7;

int arr[mxN];

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    int n, k;
    cin >> n >> k;
    
    bitset<2000000001> in;
    for (int i = 0; i < n + k; ++i) {
        cin >> arr[i];
        in[arr[i]] = true;
    }

    if (n <= 4 * k) {
        for (int i = 0; i < n + k; ++i) {
            cin >> arr[i];
            in[arr[i]] = true;
        }
        
        assert(n >= 2);
        for (int i = 0; i < k + 2;  ++i) {
            for (int j = n + k - 1; j >= n - 1 && j > i; --j) {
                int sum = arr[i] + arr[j];

                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);
                }
            }
        }
    }
    else {
        map<int,int> freq;
        for (int i = 0; i < 2 * k + 2;  ++i) {
            for (int j = n + k - 1; j >= n - k - 1; --j) {
                int sum = arr[i] + arr[j];
                freq[sum]++;
            }
        }

        for (auto p : freq) {
            if (p.second >= k) {
                int sum = p.first;
                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);
                }
            }
        }
    }
    
    assert(false);
}
// 1 2 1 2 3

Compilation message (stderr)

tabletennis.cpp: In function 'int32_t main()':
tabletennis.cpp:40:33: 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]
   40 |                 if (nums.size() >= n) {
      |                     ~~~~~~~~~~~~^~~~
tabletennis.cpp:69:33: 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]
   69 |                 if (nums.size() >= n) {
      |                     ~~~~~~~~~~~~^~~~

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