Submission #377644

#	Time	Username	Problem	Language	Result	Execution time	Memory
377644		wildturtle	Table Tennis (info1cup20_tabletennis)	C++14	87 / 100	3063 ms	52828 KiB

tabletennis

#include<bits/stdc++.h>
using namespace std;
long long a,b,c,d,i,e,f,g,n,m,k,l,cnt,A[500005];
map <long long,long long> mp,mp1,mp2;
vector <long long> v,st;
long long check(long long sum) {
    for(long long i=1;i<=n;i++) mp1[A[i]]++;
    cnt=0; v.clear();
    for(long long i=1;i<=n;i++) {
        if(mp1[A[i]]==0) continue;
        mp1[A[i]]--;
        if(mp1[sum-A[i]]>=1) {
            cnt++; mp1[sum-A[i]]=0; 
            v.push_back(A[i]);
            v.push_back(sum-A[i]);
            if(cnt==(n-k)/2) break;
        }
    }
    mp1.clear();
    if(cnt>=(n-k)/2) return 1;
    else return 0;
}
int main() {
    ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    cin>>n>>k;
    n+=k;
    for(long long i=1;i<=n;i++) {
        cin>>A[i];
    }
    sort(A+1,A+1+n);
    if(n>=4*k) {
        for(long long i=1;i<=2*k;i++) {
            for(long long j=n-2*k+1;j<=n;j++) {
                mp[A[i]+A[j]]++;
            }
        }
        for(long long i=1;i<=2*k;i++) {
            for(long long j=n-2*k+1;j<=n;j++) {
                if(mp[A[i]+A[j]]>=k) { 
                    if(mp2[A[i]+A[j]]==0) st.push_back(A[i]+A[j]); 
                    mp2[A[i]+A[j]]=1;
                }
            }
        }
        for(long long i=0;i<st.size();i++) {
            if(check(st[i])) break;
        }
        sort(v.begin(),v.end());
        for(long long i=0;i<v.size();i++)
        cout<<v[i]<<" ";
    }
    else {
        for(long long i=1;i<=k;i++) {
            for(long long j=n-k+i-1;j<=n;j++) {
                if(mp2[A[i]+A[j]]==0) st.push_back(A[i]+A[j]); 
                mp2[A[i]+A[j]]=1;
            }
        }
        for(long long i=0;i<st.size();i++) {
            if(check(st[i])) break;
        }
        sort(v.begin(),v.end());
        for(long long i=0;i<v.size();i++)
        cout<<v[i]<<" ";
    }
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:45:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         for(long long i=0;i<st.size();i++) {
      |                           ~^~~~~~~~~~
tabletennis.cpp:49:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         for(long long i=0;i<v.size();i++)
      |                           ~^~~~~~~~~
tabletennis.cpp:59:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |         for(long long i=0;i<st.size();i++) {
      |                           ~^~~~~~~~~~
tabletennis.cpp:63:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for(long long i=0;i<v.size();i++)
      |                           ~^~~~~~~~~

• 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: 0 / 13