Compilare: main.cpp: In function 'int main()': main.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2 ; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i + z[i] <= s.size() and s[z[i]+1] == s[i + z[i]]) ~~~~~~~~~^~~~~~~~~~~ main.cpp:41:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i + z[i] <= s.size() and s[z[i]+1] == s[i + z[i]]) ~~~~~~~~~^~~~~~~~~~~ main.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2 ; i < sirrev.size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:54:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i + z2[i] <= sirrev.size() and sirrev[z2[i]+1] == sirrev[i + z2[i]]) ~~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:66:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i + z2[i] <= s.size() and sirrev[z2[i]+1] == sirrev[i + z2[i]]) ~~~~~~~~~~^~~~~~~~~~~ main.cpp:77:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = pattern.size() + 1; i < sirrev.size() ; ++ i) ~~~^~~~~~~~~~~~~~~ main.cpp:88:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= (pattern.size()/2) ; ++ i) ~~^~~~~~~~~~~~~~~~~~~~~