Compilare: main.cpp: In function 'll getVal(std::__cxx11::string)': main.cpp:119:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++){ ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:183:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + 1 < s.size(); i++){ ~~~~~~^~~~~~~~~~ main.cpp:186:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++){ ~~^~~~~~~~~~ main.cpp:188:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i; j < s.size(); j++){ ~~^~~~~~~~~~