Submission #1091888

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091888		plagia	Savrsen (COCI17_savrsen)	C++14	30 / 120	256 ms	39568 KiB

savrsen

#include <cstdlib>
#include <iostream>

const int MM = 1e7 + 10;
int tab[MM]{};

void fill_tab() {
	for (int i = 2; i < MM; i++) tab[i] = 1;

	for (int i = 2; i * i <= MM; i++) {
		for (int j = i * 2; j < MM; j += i) {
			tab[j] += i;	
		}
	}
}

int calculate_imperfection(const int &n) {
	return std::abs(n - tab[n]);
}

int main() {
	std::ios_base::sync_with_stdio(0);

	fill_tab();

	int a, b;
	std::cin >> a >> b;
	
	unsigned long long sum = 0;
	for (int i = a; i <= b; i++) {
		sum += calculate_imperfection(i);
	}

	std::cout << sum << std::endl;

	return 0;
}

• Subtask 1: 30 / 120