Compilare: user.cpp: In function 'int findd(const per&, const int&)': user.cpp:40: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp:78: warning: comparison between signed and unsigned integer expressions user.cpp:79: warning: comparison between signed and unsigned integer expressions