Compilare: main.cpp: In function 'int main()': main.cpp:27:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(e=0;e<s[i].size() && e<s[j].size();e++) ~^~~~~~~~~~~~ main.cpp:27:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(e=0;e<s[i].size() && e<s[j].size();e++) ~^~~~~~~~~~~~