func_code_string: #include <bits/stdc++.h>   using namespace std;   int read() {     int f = 1, x = 0;     char c = getchar();     while (c <  0  ||  9  < c) {       if (c ==  - ) f = -1;       c = getchar();     }     while ( 0  <= c && c <=  9 )       x = (x << 3) + (x << 1) + (c ^ 48), c = getchar();     return f * x;   }   const int MAXN = 100000;   const int INF = 0x3f3f3f3f;   int ans;   void Query(int L, int R, int l1, int r1, int l2, int r2) {     if (l1 > r1 || l2 > r2) return;     int le = max(l1, l2), ri = min(r1, r2);     ans = max(ans, ri - le + 1);     if ((l1 <= l2 && r2 <= r1) || (l2 <= l1 && r1 <= r2)) return;     int Mid = (L + R) >> 1;     Query(L, Mid - 1, l1, min(r1, Mid - 1), l2, min(r2, Mid - 1));     Query(L, Mid - 1, l1, min(r1, Mid - 1), max(l2, Mid + 1) - Mid, r2 - Mid);     Query(L, Mid - 1, max(l1, Mid + 1) - Mid, r1 - Mid, l2, min(r2, Mid - 1));     Query(L, Mid - 1, max(l1, Mid + 1) - Mid, r1 - Mid, max(l2, Mid + 1) - Mid,           r2 - Mid);     return;   }   int main() {     int l1 = read(), r1 = read(), l2 = read(), r2 = read();     Query(1, 1073741823, l1, r1, l2, r2);     printf( %d n , ans);     return 0;   }   