func_code_string: #include <bits/stdc++.h>   using namespace std;   #pragma GCC optimize( Ofast )   #pragma GCC optimize( no-stack-protector )   #pragma GCC optimize( unroll-loops )   #pragma GCC target( sse,sse2,sse3,ssse3,popcnt,abm,mmx,tune=native )   #pragma GCC optimize( fast-math )   #pragma GCC optimize  -O3    long long INF = (long long)1e20;   int iINF = (int)1e20;   long long mod = 1e9 + 7;   long long mult(long long a, long long b) {     if (a == 0) return 0;     if (a == 1) return (b % mod);     if (a % 2) {       long long kek = mult(a / 2, b) % mod;       kek *= 2;       kek %= mod;       kek += b;       kek %= mod;       return kek;     } else {       long long kek = mult(a / 2, b) % mod;       kek *= 2;       kek %= mod;       return kek;     }   }   long long f(long long r) {     long long odd = 0, even = 0;     long long now = 1;     bool chet = false;     while (r > 0) {       long long num = min(r, now);       if (chet)         even += num;       else         odd += num;       r -= now;       now *= 2;       chet = !chet;     }     return (mult(odd, odd) + mult(even, even) + even) % mod;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long l, r;     cin >> l >> r;     cout << (f(r) - f(l - 1) + mod) % mod;   }   