Compilare: main.cpp: In function 'int main()': main.cpp:17:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x = 1, p = 0;x<pat.size();x++){ ~^~~~~~~~~~~ main.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x = 0, i = 0;x<str.size();){ ~^~~~~~~~~~~ main.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == pat.size()){ ~~^~~~~~~~~~~~~