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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define fi first
  5. #define se second
  6. #define MOD 1000000007
  7. #define FOR(i,a,b) for (int i = (a);i <= (b);i++)
  8. #define FOD(i,a,b) for (int i = (b);i >= (a);i--)
  9. #define ALL(x) (x).begin(),(x).end()
  10. #define ii pair<ll,ll>
  11. #define iii pair<int,pair<int,int>>
  12. //const int MOD = 998244353;
  13. const int MAXN = 1e3 + 7;
  14. vector<int> v;
  15. bool Prime[MAXN];
  16. void sieve(){
  17.     Prime[0] = Prime[1] = true;
  18.     FOR(i,2,(int)sqrt(MAXN))
  19.     if (!Prime[i])
  20.     for (int j = i * i;j <= MAXN;j += i)
  21.     Prime[j] = true;
  22.     FOR(i,1,MAXN)if (!Prime[i])
  23.     v.push_back(i);
  24. }
  25. int random(int l,int r){
  26.     return l + rand() % (r - l + 1);
  27. }
  28. int Pow(int a,int b,int mod){
  29.     if (b == 1)return a;
  30.     ll x = Pow(a,b / 2,mod);
  31.     if (b & 1)return x * x % mod * a % mod;
  32.     return x * x % mod;
  33. }
  34. bool prime(int n){
  35.     if (n == 2)return true;
  36.     FOR(i,1,2){
  37.         int x = random(2,n - 1);
  38.         if (Pow(x,n - 1,n) != 1)return false;
  39.     }
  40.     return true;
  41. }
  42. bool is_square(int n){
  43.     int c = sqrt(n + 4);
  44.     return c * c == n || (c - 1) * (c - 1) == n;
  45. }
  46. int check(int n){
  47.     int ans = 1;
  48.     for (auto i : v)if (n % i == 0){
  49.         int res = 1;
  50.         while(n % i == 0){
  51.             res++;
  52.             n = n / i;
  53.         }
  54.         ans = ans * res;
  55.     }else if (i * i * i > n)break;
  56.     if (n > 1)
  57.     if (prime(n))ans = ans * 2;
  58.     else if (is_square(n))ans = ans * 3;
  59.     else ans = ans * 4;
  60.     return ans;
  61. }
  62. int main(){
  63.     ios_base::sync_with_stdio(false);
  64.     cin.tie(0); cout.tie(0);
  65.     //freopen("MRG.INP","r",stdin);
  66.     //freopen("MRG.OUT","w",stdout);
  67.     srand(time(NULL));
  68.     sieve();
  69.     int l,r;cin >> l >> r;
  70.     int q = 0,k,t,cnt = 0;
  71.     FOR(i,l,r){
  72.         int res = check(i);
  73.         if (res > q){
  74.             q = res;
  75.             k = i;t = 0;
  76.         }
  77.         if (res == q)t++;
  78.     }
  79.     cout << q << ' ' << k << ' ' << t;
  80.     return 0^0;
  81. }
Success #stdin #stdout 1.41s 5272KB
comments (?)
stdin 
999000000 1000000000
stdout 
1024 999999000 1
https://ideone.com/sMwkex
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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