Submission #1350454

#	Time	Username	Problem	Language	Result	Execution time	Memory
1350454		hanguyendanghuy	Savrsen (COCI17_savrsen)	C++20	0 / 120	1 ms	836 KiB

savrsen

#include <bits/stdc++.h>
using namespace std;
#define ll int
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(),x.end()
const ll MAXN=1e7+5,MOD=1e9+7,INF=1e9,MAXV=1e7;
ll i,n,m,j,k,p,ans,cnt,dem,nt[MAXN];
long long luu[MAXN];
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    freopen("HHH.inp","r",stdin);
    freopen("HHH.out","w",stdout);
    ll l,r;
    cin>>l>>r;
    luu[1]=1;
    for(i=2;i*i<=r;i++){
        if(!nt[i]){
            for(j=i;j<=r;j+=i)
                nt[j]=i;
        }
    }
    for(i=2;i<=r;i++){
        if(!nt[i]){
            for(j=i;j<=r;j+=i)
                nt[j]=i;
        }
        ll last=nt[i];
        long long cur=1,m=i;
        while(m%last==0){
            cur*=last;
            m/=last;
        }
        cur*=last;
        luu[i]=luu[m]*((cur-1)/(last-1));
    }
    long long ans=0;
    for(i=l;i<=r;i++){
        luu[i]-=i;
        ans+=abs(i-luu[i]);
    }
    cout<<ans;
}

Compilation message (stderr)

savrsen.cpp: In function 'int main()':
savrsen.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen("HHH.inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
savrsen.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen("HHH.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 120