Submission #636431

#	Time	Username	Problem	Language	Result	Execution time	Memory
636431		dozer	Savrsen (COCI17_savrsen)	C++14	30 / 120	907 ms	39464 KiB

savrsen

#include <bits/stdc++.h>
using namespace std;
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define sp " "
#define endl "\n"
#define pb push_back
#define pii pair<int , int>
#define st first
#define nd second
#define N 10000005

int sum[N];

int32_t main()
{
	fastio();

	int a, b;
	cin>>a>>b;

	for (int i = 1; i < N; i++)
	{
		for (int j = i * 2; j < N; j += i)
			sum[j] += i;
	}

	int ans = 0;
	for (int i = a; i < b + 1; i++)
	{
		int a = (i * (i + 1)) / 2;
		ans += abs(sum[i] - i);
	}
	cout<<ans<<endl;


	cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}

Compilation message (stderr)

savrsen.cpp: In function 'int32_t main()':
savrsen.cpp:31:7: warning: unused variable 'a' [-Wunused-variable]
   31 |   int a = (i * (i + 1)) / 2;
      |       ^

• Subtask 1: 30 / 120