Compilare: main.cpp: In function 'bool folosit(int)': main.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s.size();++i) ~^~~~~~~~~~ main.cpp: In function 'int cojo(int, int)': main.cpp:21:9: warning: unused variable 'ok' [-Wunused-variable] int ok=0; ^~ main.cpp: In function 'int main()': main.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s.size();++i) ~^~~~~~~~~~