Compilare: main.cpp: In function 'int main()': main.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<str.size()-p+1;i++){ ~^~~~~~~~~~~~~~~ main.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<str.size()-p+1;i++){ ~^~~~~~~~~~~~~~~