Submission #168918

#	Time	Username	Problem	Language	Result	Execution time	Memory
168918		abil	Gift (IZhO18_nicegift)	C++14	0 / 100	2025 ms	63868 KiB

nicegift

#include <bits/stdc++.h>

#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define all(s) s.begin(),s.end()
//#define int long long

using namespace std;

const int N = (1e6 + 12);
const int mod = (1e9 + 7);
const int INF = (0x3f3f3f3f);

int a[N];
set<pair<int,int > > s;
vector<pair<int,pair<int,int > > > vec;
main()
{
	int n, k, sum = 0;
	scanf("%d%d", &n, &k);
	for(int i = 1;i <= n; i++){
		scanf("%d", &a[i]);
		sum += a[i];
		s.insert({a[i], i});
	}
	if(sum % k != 0){
		cout << -1;
		return 0;
	}
	while(!s.empty()){
		pair<int,int > x, y;
		x = *s.begin();
		s.erase(s.begin());
		y = *s.begin();
		s.erase(s.begin());
		vec.pb({x.fr, {x.sc, y.sc}});
		if(y.fr - x.fr > 0){
			s.insert({y.fr - x.fr, y.sc});
		}
	}
	cout << vec.size() << endl;
	for(auto to : vec){
		cout << to.fr << " " << to.sc.fr << " " << to.sc.sc << endl;
	}
}

Compilation message (stderr)

nicegift.cpp:19:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
nicegift.cpp: In function 'int main()':
nicegift.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &k);
  ~~~~~^~~~~~~~~~~~~~~~
nicegift.cpp:24:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ~~~~~^~~~~~~~~~~~~

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