赵兰松01
UID: 3495, Registered at 2026-7-18 20:00:25, last login at 2026-7-19 9:04:53, last active at 2026-8-20 16:06:47.
Solved 1 problems, RP: 9.75 (No. 736)
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Bio
#include<bits/stdc++.h> using namespace std; bool isprime[10000001]; long long ans=0; int main(){ int n; cin>>n; for(long long i=2;i<=n;i++){ if(isprime[i]==0){ for(long long j=i*i;j<=n;j+=i){ if(isprime[j]==0){ isprime[j]=1; ans+=i; } } ans+=i; } } cout<<ans; return 0; }
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Accepted Problems
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Problem Tags
- GESPC++ 二级
- 1