Compilare: main.cpp: In function 'int main()': main.cpp:193:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s.size();i++){ ~^~~~~~~~~ main.cpp:222:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ~^~~~~~~~~ main.cpp:231:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ~^~~~~~~~~ main.cpp:240:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<st.size();i++) ~^~~~~~~~~~