Submission #234888

#	Time	Username	Problem	Language	Result	Execution time	Memory
234888		mahmoudbadawy	Sirni (COCI17_sirni)	C++17	0 / 140	1766 ms	262228 KiB

sirni

#include <bits/stdc++.h>

using namespace std;

const int N=1e5+5,M=1e7+7;

int n;
int arr[N];
vector< pair<int,int> > ed[M];
int uni[N];

int uni_find(int x)
{
	return uni[x]=(uni[x]==x?x:uni_find(uni[x]));
}

int unio(int x,int y)
{
	x=uni_find(x); y=uni_find(y);
	if(x==y) return 0;
	uni[x]=y;
	return 1;
}

int main()
{
	scanf("%d",&n);
	set<int> ss;
	for(int i=0;i<n;i++)
	{
		scanf("%d",&arr[i]);
		ss.insert(arr[i]);
	}
	n=0;
	for(int i:ss) arr[n++]=i;
	for(int i=0;i<n;i++)
	{
		int s=i+1;
		assert(arr[i]);
		for(int j=arr[i];j<arr[n-1];j+=arr[i])
		{
			while(s<n && arr[s]<=j) s++;
			if(s<n) ed[arr[s]%j].emplace_back(i,s);
		}
	}
	iota(uni,uni+n,0);
	long long ans=0;
	for(int i=0;i<N;i++)
	{
		for(auto j:ed[i])
		{
			if(unio(j.first,j.second)) ans+=i;
		}
	}
	cout << ans << endl;
}

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
sirni.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&arr[i]);
   ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 14
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 14
• Subtask 6: 0 / 14
• Subtask 7: 0 / 14
• Subtask 8: 0 / 14
• Subtask 9: 0 / 14
• Subtask 10: 0 / 14