Compilare: user.cpp: In function ‘int z(int, int, int, int, int)’: user.cpp:14:22: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 0*(1<<k-1)*(1<<k-1) + z(xa, ya, mx, my, k-1); ^ user.cpp:14:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 0*(1<<k-1)*(1<<k-1) + z(xa, ya, mx, my, k-1); ^ user.cpp:16:22: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 1*(1<<k-1)*(1<<k-1) + z(xa, my+1, mx, yb, k-1); ^ user.cpp:16:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 1*(1<<k-1)*(1<<k-1) + z(xa, my+1, mx, yb, k-1); ^ user.cpp:18:22: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 2*(1<<k-1)*(1<<k-1) + z(mx+1, ya, xb, my, k-1); ^ user.cpp:18:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 2*(1<<k-1)*(1<<k-1) + z(mx+1, ya, xb, my, k-1); ^ user.cpp:20:22: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 3*(1<<k-1)*(1<<k-1) + z(mx+1, my+1, xb, yb, k-1); ^ user.cpp:20:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return 3*(1<<k-1)*(1<<k-1) + z(mx+1, my+1, xb, yb, k-1); ^ user.cpp:11:9: warning: unused variable ‘av’ [-Wunused-variable] av = 0; ^ user.cpp: In function ‘int main()’: user.cpp:26:12: warning: unused variable ‘ans’ [-Wunused-variable] int k, ans; ^ user.cpp: In function ‘int z(int, int, int, int, int)’: user.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:24:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.in", "r", stdin); ^ user.cpp:25:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.out", "w", stdout); ^ user.cpp:28:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:30:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^