Compilare: main.cpp: In function 'int main()': main.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ~^~~~~~~~~ main.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+2;j<s.size()-1;j++){ ~^~~~~~~~~~~ main.cpp:62:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+3;j<s.size()-1;j++){ ~^~~~~~~~~~~