Submission #514417

#	Time	Username	Problem	Language	Result	Execution time	Memory
514417		Theo830	Table Tennis (info1cup20_tabletennis)	C++17	35 / 100	3109 ms	462544 KiB

tabletennis

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ii,ll>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
bool check(vll a){
    ll sum = a[0] + a.back();
    ll n = a.size();
    f(j,0,n){
        if(sum != (a[j] + a[n - j - 1])){
            return false;
        }
    }
    return true;
}
int main(void){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n,k;
    cin>>n>>k;
    ll arr[n+k];
    vll ans[2];
    map<ll,bool>ex;
    f(i,0,n+k){
        cin>>arr[i];
        ex[arr[i]] = 1;
    }
    map<ll,ll>mp;
    ll sum = 0;
    f(i,0,n+k){
        f(j,0,n+k){
            if(i != j){
                mp[arr[i] + arr[j]]++;
                if(mp[arr[i]+arr[j]] == n){
                    sum = arr[i] + arr[j];
                }
            }
        }
    }
    f(i,0,n+k){
        if(ex[sum - arr[i]]){
            ans[0].pb(arr[i]);
            ans[1].pb(sum - arr[i]);
        }
        if(ans[0].size() == n/2){
            break;
        }
    }
    for(auto x:ans[0]){
        cout<<x<<" ";
    }
    reverse(all(ans[1]));
    for(auto x:ans[1]){
        cout<<x<<" ";
    }
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:64:26: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   64 |         if(ans[0].size() == n/2){
      |            ~~~~~~~~~~~~~~^~~~~~

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