Compilare: user.cpp: In function ‘int main()’: user.cpp:144:15: warning: unused variable ‘i’ [-Wunused-variable] int k, a, b, i; ^ user.cpp: In function ‘std::pair<int, int> ReduCadran(std::pair<int, int>, int)’: user.cpp:111:1: warning: control reaches end of non-void function [-Wreturn-type] } ^