Compilare: main.cpp: In function 'int main()': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < s.size() ; j++) ~~^~~~~~~~~~ main.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < s.size() && s[j] >= '0' && s[j] <= '9') ~~^~~~~~~~~~ main.cpp:76:18: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] g << last << " " << ans; ^~~