#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define pii pair <int, int>
#define sz(a) (int)(a.size())
#define resize(v) v.resize(unique(all(v)) - v.begin());
#define all(a) a.begin(), a.end()
#define forit(it, s) for(__typeof(s.begin()) it = s.begin(); it != s.end(); it ++)
#define int long long
using namespace std;
void Fast_Read_Out()
{
ios_base::sync_with_stdio(0);
cin.tie(), cout.tie();
}
void Random()
{
unsigned int seed;
asm("rdtsc" : "=A" (seed));
srand(seed);
}
unsigned int Time()
{
unsigned int time = clock() / 1000.00;
return time;
}
const int inf = (1e9) + 123;
const int N = (1e7);
long long sum[N + 1];
void Resheto()
{
for(int i = 2; i <= N; i++)
for(int j = i + i; j <= N; j += i) sum[j] += i;
sum[1] = 1;
}
main ()
{
#ifdef JUDGE
freopen("input.txt", "r", stdin);
#endif
Random();
Fast_Read_Out();
long long a, b;
cin >> a >> b;
long long sm = 0;
Resheto();
for(int i = a; i <= b; i++) sm += abs(i - sum[i] - 1);
cout << sm << endl;
#ifdef JUDGE
// cout << Time() << endl;
#endif
}
// Easy Peasy Lemon Squeezy Sometimes it's the very people who no one imagines anything of who do the things no one can imagine.
Compilation message
savrsen.cpp:46:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main ()
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2089 ms |
78584 KB |
Output is correct |
| 2 |
Correct |
2097 ms |
78704 KB |
Output is correct |
| 3 |
Correct |
2090 ms |
78720 KB |
Output is correct |
| 4 |
Correct |
1998 ms |
78776 KB |
Output is correct |
| 5 |
Correct |
1994 ms |
78836 KB |
Output is correct |
| 6 |
Correct |
2016 ms |
78876 KB |
Output is correct |
| 7 |
Correct |
2004 ms |
78876 KB |
Output is correct |
| 8 |
Correct |
2028 ms |
78876 KB |
Output is correct |
