Compilare: user.cpp: In function ‘long long unsigned int solve2(int, long long int, long long int)’: user.cpp:4:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define w (1<<31) ^ user.cpp:46:30: note: in expansion of macro ‘w’ if(P%2) {a=a*N;if(a> w ) a=a%MOD;} ^ user.cpp:42:31: warning: unused variable ‘ret’ [-Wunused-variable] unsigned long long a = N, ret = 1; ^ user.cpp:43:14: warning: unused variable ‘i’ [-Wunused-variable] unsigned i; ^