Compilare: main.cpp: In function 'void calcpi()': main.cpp:11:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v.size();i++) ~^~~~~~~~~ main.cpp: In function 'void calcz()': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v.size();i++) ~^~~~~~~~~ main.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+z[i]-1<v.size()&&v[i+z[i]]==v[z[i]]) ~~~~~~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~