Compilare: main.cpp: In function 'long long unsigned int exponent(long long unsigned int, long long unsigned int)': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;(1<<i)<=b;++i){ ~~~~~~^~~ main.cpp:14:24: warning: unused variable 'c' [-Wunused-variable] unsigned long long c=a; ^ main.cpp: In function 'int main()': main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n-contor;++i) ~^~~~~~~~~~ main.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=contor;++i) ~^~~~~~~~ main.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ~^~~