Compilare: main.cpp: In function 'int compute()': main.cpp:83:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < val.size();++i) { ~~^~~~~~~~~~~~ main.cpp: In function 'int getRes(int, int, char)': main.cpp:50:1: warning: control reaches end of non-void function [-Wreturn-type] } ^