Compilare: main.cpp: In function 'int STOI(std::__cxx11::string)': main.cpp:11:23: 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:41:17: warning: unused variable 'j' [-Wunused-variable] int j; ^ main.cpp:42:45: warning: 'ls' may be used uninitialized in this function [-Wmaybe-uninitialized] string tmp = text.substr(li, ls - li + 1); ~~~^~~~ main.cpp:23:13: warning: 'li' may be used uninitialized in this function [-Wmaybe-uninitialized] int i,n,li,ls,stimp=0; ^~