Submission #675184

#	Time	Username	Problem	Language	Result	Execution time	Memory
675184		vjudge1	Table Tennis (info1cup20_tabletennis)	C++17	100 / 100	321 ms	32412 KiB

tabletennis

#include<bits/stdc++.h>
using namespace std;
int a[151000];
int n,k;
bool check(int x){
    int l = 1;
    int r = n;
    int cnt = 0;
    while (l < r){
        if (a[l] + a[r] > x){cnt++;r--;}
        else if (a[l] + a[r] < x){l++;cnt++;}
        else{l++;r--;}
        if (cnt > k)return 0;
    }
    vector <int> ans;
    l = 1;
    r = n;
    while (l < r){
        if (a[l] + a[r] > x){r--;}
        else if (a[l] + a[r] < x){l++;}
        else{if (ans.size() < n - k){ans.push_back(a[l]);ans.push_back(a[r]);}l++;r--;}
    }
    sort(ans.begin(),ans.end());
    for (auto y:ans)cout<<y<<' ';
    cout<<'\n';
    return 1;
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(nullptr);cout.tie(nullptr);
    cin>>n>>k;n += k;
    for (int i = 1;i <= n;i ++){
        cin>>a[i];
    }
    map <int,int> cnt;
    for (int i = 1;i <= 2 * k &&  i <= n;i ++){
        for (int j = max(1,n - 2 * k + 1);j <= n;j ++){
            cnt[a[i] + a[j]]++;
        }
    }
    for (auto x:cnt){
        if (x.second >= k || x.second >= n - k){
            if (check(x.first))return 0;
        }
    }
}

Compilation message (stderr)

tabletennis.cpp: In function 'bool check(int)':
tabletennis.cpp:21:29: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |         else{if (ans.size() < n - k){ans.push_back(a[l]);ans.push_back(a[r]);}l++;r--;}
      |                  ~~~~~~~~~~~^~~~~~~

• 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