Compilare: main.cpp: In function 'void preprocessit()': main.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < a.size(); i++){ ~~^~~~~~~~~~ main.cpp: In function 'void findit()': main.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < b.size(); i++){ ~~^~~~~~~~~~ main.cpp:49:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x == a.size()-1){ ~~^~~~~~~~~~~~~