Compilare: main.cpp: In function 'void build()': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<arr[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void AC()': main.cpp:105:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<text.size();i++) ~^~~~~~~~~~~~