func_code_string: #include <bits/stdc++.h>   #pragma comment(linker,  /STACK:16777216 )   using namespace std;   void rot(int n, int *x, int *y, int rx, int ry);   int xy2d(int n, int x, int y) {     int rx, ry, s, d = 0;     for (s = n / 2; s > 0; s /= 2) {       rx = (x & s) > 0;       ry = (y & s) > 0;       d += s * s * ((3 * rx) ^ ry);       rot(s, &x, &y, rx, ry);     }     return d;   }   void d2xy(int n, int d, int *x, int *y) {     int rx, ry, s, t = d;     *x = *y = 0;     for (s = 1; s < n; s *= 2) {       rx = 1 & (t / 2);       ry = 1 & (t ^ rx);       rot(s, x, y, rx, ry);       *x += s * rx;       *y += s * ry;       t /= 4;     }   }   void rot(int n, int *x, int *y, int rx, int ry) {     int t;     if (ry == 0) {       if (rx == 1) {         *x = n - 1 - *x;         *y = n - 1 - *y;       }       t = *x;       *x = *y;       *y = t;     }   }   int main() {     int a, b;     cin >> a >> b;     int x, y;     d2xy(1 << a, b, &x, &y);     cout << x <<     << y << endl;     return 0;   }   