Compilare: main.cpp: In function 'int main()': main.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) ~^~~~~~~~~ main.cpp:84:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=poz-1;++i) ~^~~~~~~ main.cpp:91:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=poz-1;++i) ~^~~~~~~ main.cpp:98:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=poz-1;++i) ~^~~~~~~ main.cpp:106:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=poz-1;++i) ~^~~~~~~ main.cpp:16:40: warning: variable 'ps' set but not used [-Wunused-but-set-variable] unsigned long long int poz=n%k,ps; ^~