Submission #514361

#	Time	Username	Problem	Language	Result	Execution time	Memory
514361		Theo830	Table Tennis (info1cup20_tabletennis)	C++17	11 / 100	16 ms	3904 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 a;
    f(i,0,n+k){
        cin>>arr[i];
        a.pb(arr[i]);
    }
    vll ans;
    a.pop_back();
    if(check(a)){
        ans = a;
    }
    a.pb(arr[n+k-1]);
    a.erase(a.begin());
    if(check(a)){
        ans = a;
    }
    ll sum = a[0] + a.back();
    a.insert(a.begin(),arr[0]);
    f(j,1,(n+k)/2){
        if(a[j] + a[n+k-j-1] != sum){
            if(ans.empty()){
                if(a[j+1] + a[n+k-j-1] == sum){
                    a.erase(a.begin() + j);
                }
                else{
                    a.erase(a.begin()+n+k-j-1);
                }
            }
        }
    }
    for(auto x:ans){
        cout<<x<<" ";
    }
}

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