Compilare: main.cpp: In function 'int main()': main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<s2.size();i++) ~^~~~~~~~~~ main.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i+z[i]<s2.size()&&s2[z[i]]==s2[i+z[i]]) ~~~~~~^~~~~~~~~~ main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<s2.size();i++) ~^~~~~~~~~~ main.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i+z1[i]<s2.size()&&s2[z1[i]]==s2[i+z1[i]]) ~~~~~~~^~~~~~~~~~