Submission #518358

#	Time	Username	Problem	Language	Result	Execution time	Memory
518358		Ronin13	Table Tennis (info1cup20_tabletennis)	C++14	100 / 100	417 ms	43616 KiB

tabletennis

#include<bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define epb emplace_back
#define inf 1e9+1
#define linf 1e18+11
using namespace std;

map<ll,int>used;
int main(){
    int n;cin>>n;
    int k;cin>>k;
    n+=k;
    int a[n+1];
    for(int i=1;i<=n;i++)cin>>a[i];
    vector<int>vec;
    if(n>=4*k){
        for(int i=1;i<=2*k+1;i++){
            for(int j=n;j>=n-2*k;j--){
                int x=a[i]+a[j];
                used[x]++;
                if(used[x]==k)vec.pb(x);
            }
        }
    }
    else{
        for(int i=1;i<=k+1;i++){
            for(int j=n;j>=n-k;j--){
                int x=a[i]+a[j];
                vec.pb(x);
            }
        }
    }
    for(int to:vec){
        int l=1,r=n;
        vector<int>ans;
        while(l<r){
            if(ans.size()==(n-k))break;
            if(a[l]+a[r]==to){
                ans.pb(a[l]);
                ans.pb(a[r]);
                l++;
                r--;
                continue;
            }
            if(a[l]+a[r]>to){
                r--;
                continue;
            }
            l++;
        }
        if(ans.size()==(n-k)){
            sort(ans.begin(),ans.end());
            for(int x:ans)cout<<x<<' ';
            return 0;
        }
        ans.clear();
    }
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:43:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |             if(ans.size()==(n-k))break;
      |                ~~~~~~~~~~^~~~~~~
tabletennis.cpp:57:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   57 |         if(ans.size()==(n-k)){
      |            ~~~~~~~~~~^~~~~~~

• 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