Compilare: main.cpp: In function 'int main()': main.cpp:40:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=s.length();i++) ~^~~~~~~~~~~~ main.cpp:42:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.length();i++){ ~^~~~~~~~~~~ main.cpp:33:9: warning: unused variable 't' [-Wunused-variable] int t,i,j,pos; ^