Compilare: main.cpp: In member function 'long long int Task::fast_pow(long long int, long long int, long long int)': main.cpp:39:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:24:19: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] x = (2*x)%mod; ~~^~~ main.cpp:20:28: note: 'x' was declared here long long rez = 0, x; ^