Submission #89500

#	Time	Username	Problem	Language	Result	Execution time	Memory
89500		RAkhshon	Gift (IZhO18_nicegift)	C++17	7 / 100	1663 ms	34692 KiB

nicegift

#include<bits/stdc++.h>
#define ll long long
#define fr first
#define se second
using namespace std;
deque< pair<ll, ll> > d;
vector< pair<ll,pair< ll, ll> > > ans;
int main(){
ll n, k;
cin>>n>>k;
for( ll i =1 ; i <= n ; i ++ ){
    ll x;
    cin>>x;
    d.push_back({x,i});
}
sort(d.begin(),d.end());
while(d.size()>1){
     ll i = d.size()-1;
     ll j = d.size()-2;
     if( d[i].fr - d[j].fr > 0 ){
        ll x = d[i].fr-d[j].fr;
        ll ra = d[j].fr;
        ll l = d[i].se;
        ll r = d[j].se;
        d.pop_back();
        d.pop_back();
        d.push_back({x,l});
        ans.push_back({ra,{l,r}});
        sort(d.begin(),d.end());
     }
     else if( d[i].fr - d[j].fr == 0 ) {
         ll x = d[i].fr-d[j].fr;
         ll ra = d[j].fr;

        ll l = d[i].se;
        ll r = d[j].se;
        d.pop_back();
        d.pop_back();
        ans.push_back({ra,{l,r}});
     }
    /// cout<<d.size()<<endl;
}
if( d.size() == 1 ){
    cout<<-1;
    return 0;
}
cout<<ans.size()<<endl;
for( ll i = 0; i < ans.size(); i  ++ ){
    cout<<ans[i].fr<<' '<<ans[i].se.fr<<' '<<ans[i].se.se<<endl;
}
}

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:32:13: warning: unused variable 'x' [-Wunused-variable]
          ll x = d[i].fr-d[j].fr;
             ^
nicegift.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for( ll i = 0; i < ans.size(); i  ++ ){
                ~~^~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 51