Compilare: user.cpp: In function ‘bool M1()’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i * i <= P; ++i) ^ user.cpp:31:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i * i == P) ^ user.cpp: In function ‘bool M2()’: user.cpp:42:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i * i * i <= P; ++i) ^ user.cpp:43:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i * i * i == P) ^ user.cpp: In function ‘bool M3()’: user.cpp:53:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i * i * i * i <= P; ++i) ^ user.cpp:54:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i * i * i * i == P) ^ user.cpp: In function ‘void Descompose()’: user.cpp:69:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i * i <= aux && Radical > 1; ++i) ^