Compilare: main.cpp: In function 'int main()': main.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s2.size();i++) ~^~~~~~~~~~ main.cpp:21:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+a[i]<s2.size() && s2[a[i]]==s2[i+a[i]]) ~~~~~~^~~~~~~~~~ main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s2.size();i++) ~^~~~~~~~~~ main.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+b[i]<s2.size() && s2[b[i]]==s2[i+b[i]]) ~~~~~~^~~~~~~~~~