Compilare: main.cpp: In function 'int cost_transform(std::__cxx11::string, std::__cxx11::string)': main.cpp:18:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=a.length(); ++i) ~^~~~~~~~~~~~ main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1; j<=b.length(); ++j) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:25:28: warning: unused variable 'max1' [-Wunused-variable] int n,q,i,k,j,l,x,min1,max1=2; ^~~~