Compilare: user.cpp: In function ‘void refac(int, int, int)’: user.cpp:15:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == n) ^ user.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nr[i+1][j] < k || k - nr[i+1][j] < 0) ^ user.cpp: In function ‘int main()’: user.cpp:39:31: 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(a[i], 0, sizeof(a[i])); ^ user.cpp:40:31: 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(s[i], 0, sizeof(s[i])); ^ user.cpp:41:32: 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(nr[i], 0, sizeof(nr[i])); ^