Compilare: main.cpp: In function 'int main()': main.cpp:78:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ~^~~~~~~~~ main.cpp:85:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size()-1;i++){ ~^~~~~~~~~~~ main.cpp:83:9: warning: unused variable 't' [-Wunused-variable] int t; ^