Compilare: main.cpp: In function 'int main()': main.cpp:16:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l<s[i].size()) ~^~~~~~~~~~~~ main.cpp:18:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(l==s[i].size() && s[i]<r) ~^~~~~~~~~~~~~ main.cpp:29:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(l1<s[i].size() && l2<s[j].size()) ~~^~~~~~~~~~~~ main.cpp:29:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(l1<s[i].size() && l2<s[j].size()) ~~^~~~~~~~~~~~ main.cpp:37:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l1==s[i].size()) ~~^~~~~~~~~~~~~