Compilare: main.cpp: In function 'char solve(std::__cxx11::string)': main.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < x.size(); ) ~~^~~~~~~~~~ main.cpp:15:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if ( (x[i] >= 'A' && x[i] <= 'Z') && (i + 1 >= x.size() || x[i + 1] == ' ') ) ~~~~~~^~~~~~~~~~~ main.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < fin.size();) ~~^~~~~~~~~~~~ main.cpp:56:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < fin.size();) ~~^~~~~~~~~~~~ main.cpp:67:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < fin.size();) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:80:8: warning: unused variable 'j' [-Wunused-variable] {int i,j; ^