제출 #1162059

#제출 시각아이디문제언어결과실행 시간메모리
1162059nguyenkhangninh99Savrsen (COCI17_savrsen)C++20
120 / 120
1027 ms78712 KiB
#include "bits/stdc++.h"
using namespace std;

using i64 = long long;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 1e7 + 7;
i64 f[N];

int main() {
  cin.tie(0)->sync_with_stdio(0);
  int a, b;
  cin >> a >> b;
  for (int i = 1; i <= b; i++) {
    for (int j = i; j <= b; j += i) {
      f[j] += i;
    }
    f[i] = abs(i - (f[i] - i)) + f[i - 1];
  }
  cout << f[b] - f[a - 1];
}
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