Compilare: user.cpp: In function ‘int find1(unsigned int)’: user.cpp:10:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[a] >= 0 && a < n) ^ user.cpp:12:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a == n) ^ user.cpp: In function ‘int find2(unsigned int)’: user.cpp:18:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[b] <= 0 && b<n) ^ user.cpp:20:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (b == n) ^ user.cpp: In function ‘void ret(unsigned int, unsigned int, unsigned int&)’: user.cpp:28:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a != -1) ^