Submission #424460

#	Time	Username	Problem	Language	Result	Execution time	Memory
424460		jamezzz	Table Tennis (info1cup20_tabletennis)	C++17	100 / 100	375 ms	33692 KiB

tabletennis

#include <bits/stdc++.h>
using namespace std;

#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define all(x) x.begin(),x.end()

int n,k,v;
vector<int> s,ans;
map<int,int> cnt;

int main(){
	sf("%d%d",&n,&k);
	n+=k;
	for(int i=0;i<n;++i){
		sf("%d",&v);
		s.push_back(v);
	}
	sort(all(s));
	if(n>=4*k){
		for(int i=0;i<2*k;++i){
			for(int j=n-2*k;j<n;++j){
				cnt[s[i]+s[j]]+=1;
			}
		}
	}
	else{
		for(int i=0;i<n;++i){
			for(int j=i+1;j<n;++j)cnt[s[i]+s[j]]=k;
		}
	}
	for(auto it:cnt){
		if(it.se>=k){
			ans.clear();
			int cr=n-1;
			for(int i=0;i<n;++i){
				if(s[i]>=it.fi-s[i])break;
				while(it.fi-s[i]<s[cr])--cr;
				if(it.fi-s[i]==s[cr]){
					ans.pb(s[i]);
					ans.pb(it.fi-s[i]);
					--cr;
				}
				if(ans.size()==n-k)break;
			}
			if(ans.size()==n-k)break;
		}
	}
	sort(all(ans));
	for(int x:ans)pf("%d ",x);
	pf("\n");
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:47:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   47 |     if(ans.size()==n-k)break;
      |        ~~~~~~~~~~^~~~~
tabletennis.cpp:49:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   49 |    if(ans.size()==n-k)break;
      |       ~~~~~~~~~~^~~~~
tabletennis.cpp:16:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  sf("%d%d",&n,&k);
      |    ^
tabletennis.cpp:19:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   sf("%d",&v);
      |     ^

• 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