F题明显爆int的,但是用long long就wa强烈要求rejudge! include<bits/stdc++.h> using namespace std;const int N = 500009;int p[N] = {1, 1}, prime[N], pcnt, phi[N] = {0, 1}, n;long long sum[N] = {0, 1};int main(){ for(int i = 2; i < N; i++) { if(!p[i]) { phi[i] = i - 1; ...