71Ordered fractions

#include<bits/stdc++.h>using namespace std;typedef pair<int, int> pii; vector<pii> a;
int gcd (int a, int b) {return b?gcd(b, a %b) : a;
}
int main () {int c = (1000000 - 5) / (7);cout << 2+ 3 * c << endl;return 0;
}

已经知道第一个分数第第三个分数abcd第二个分数为a+cb+b∣fn=∣fn−1+ϕ(n)∣fn=1+∑m=1nϕ(m)渐近行为∣fn∣3∗n2π2已经知道第一个分数第第三个分数\frac{a}{b} \quad \frac{c}{d}\\ 第二个分数为\frac{a + c}{b + b}\\ \lvert {f_n} = \rvert {f_{n -1}}+\phi(n) \\ \lvert{f_n} = 1 + \sum_{m=1}^n{\phi(m)}\\ 渐近行为 \lvert f_n \rvert ~~ \frac{3*n^2}{\pi^2} 已经知道第一个分数第第三个分数badc第二个分数为b+ba+c∣fn=∣fn−1+ϕ(n)∣fn=1+m=1∑nϕ(m)渐近行为∣fn∣ π23∗n2

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