Submission #646020

#	Time	Username	Problem	Language	Result	Execution time	Memory
646020		mr_robot_545	Savrsen (COCI17_savrsen)	C++17	0 / 120	119 ms	131072 KiB

savrsen

//بسم الله الرحمن الرحيم
// i love mancity
#include<bits/stdc++.h>
#include <stack>
#include <vector>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define             endl "\n"
#define             ll long long
#define             f(a) for(int i=0;i<a;i++)
#define             rf(a) for(int i=a-1;i>=0;i--)
#define             w  int t;cin>>t;while(t--)
#define             all(v) v.begin(),v.end()
#define             yes cout<<"YES"<<endl;
#define             no cout<<"NO"<<endl;
#define             prev2pn(x) pow(2,floor(log2(x)))
#define             MR_Robot iostream::sync_with_stdio(false);cin.tie(nullptr); \
                    cout.tie(nullptr);
#define             arrRange(a , l , r) int _##a[(r-l)+1]; int* a= _##a-l;
#define             ordered_set tree<int, null_type,less<int>, \
                    rb_tree_tag,tree_order_statistics_node_update>
using namespace std;
using namespace __gnu_pbds;
const ll MOD=1e9+7;
const int N= 1e3+5;
const double EPS = 1e-7;
const double PI = 3.14159265;
void fact(ll  c){
    int g=500000;
    vector<ll>fa(g, 0);
    fa[0]=1;
    for (int i = 2; i <=c ; ++i) {
        for (int j = 0; j <g ; ++j) {
            fa[j]*=i;

        }
        for (int j = 0; j <g ; ++j) {
            if(fa[j] > 9){
                fa[j + 1]+=(fa[j] / 10);
                fa[j]%=10;
            }
        }
    }
    int index=0;
    for (int i = g-1; i >=0 ; --i) {
        if(fa[i] == 0)index=i;
        else break;
    }
    for (int i = index-1; i >=0 ; --i) {
        cout << fa[i];
    }
}
int power(ll xx, ll nn)
{
    ll result = 1;
    while (nn > 0) {
        if ((nn & 1) == 1) // y is odd
        {
            result = (result%MOD) * (xx%MOD);
        }
        xx = (xx%MOD) * (xx%MOD);
        nn = nn >> 1; // y=y/2;
    }
    return (result%MOD);
}
void sieve(int c){ //nlog(log(n))
    vector<bool>prime(c+1, false);
    prime[0]= prime[1]= true;
    for (int i = 2; i*i <c ; ++i) {
        if(!prime[i]){
            for (int j = i+i; j <=c ; j+=i) {
                prime[j]=true;
            }
        }
    }

    for (int i = 0; i <= c; ++i) {
        if(!prime[i])cout<<i<<endl;
    }
}
ll factorization(ll nn) { //at most log(n)
    int cnt=0;
    ll temp=nn;
    vector<ll>factors;
    while (nn % 2 == 0) {
        cnt++;
        factors.push_back(2);
        nn /= 2;
    }
    for (int i = 3; i * i <= nn; i+=2) {
        while (nn % i == 0) {
            cnt++;
            factors.push_back(i);
            nn /= i;
        }
    }
    if (nn > 1) {
        factors.push_back(nn);
    }
    map<ll, ll> mp;
    for (int i = 0; i < int(factors.size()); ++i) {
        mp[factors[i]]++;
    }
    ll a = 1;
    for (auto u: mp) {
        a *=((power(u.first,u.second+1)-1)/(u.first-1));
    }
    a-=temp;
    ll sum=abs(temp-a);
    return sum;

}


const int dx[] = {1, -1, 0, 0,1,-1} , dy[] = {0, 0, 1, -1,1,-1};
const string dir[]={"D","U","R","L","UR","DR","UL","DL"};
const string dir1[]={"Carrots","Kiwis","Grapes"};
arrRange(aa,-N ,N);
vector<int>adj[N];
bool vis[N];
int child[N];
int n,m,x,y;

void solve(){
    cin>>n>>m;
    ll sum=0;
    for (int i = n; i <=m ; ++i) {
        sum+= factorization(i);
    }
    cout<<sum<<endl;
}
int main() {
    MR_Robot
#ifndef ONLINE_JUDGE
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
#endif
//    w{
    solve();
//    }

    return 0;
}

Compilation message (stderr)

savrsen.cpp: In function 'int main()':
savrsen.cpp:135:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  135 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
savrsen.cpp:136:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  136 |     freopen("out.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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