Compilare: user.cpp: In function ‘void lgput(int (*)[21], int)’: user.cpp:41:53: warning: ‘sizeof’ on array function parameter ‘a’ will return size of ‘int (*)[21]’ [-Wsizeof-array-argument] memset(sol, 0, sizeof(sol)); memset(a, 0, sizeof(a)); ^ user.cpp:39:22: note: declared here void lgput(int a[][21], int p) { ^ user.cpp:41:51: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset(sol, 0, sizeof(sol)); memset(a, 0, sizeof(a)); ^ user.cpp:40:20: warning: unused variable ‘tmp’ [-Wunused-variable] int sol[21][21], tmp[21][21]; ^~~