Compilare: main.cpp: In function 'int main()': main.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(s); i++){ ~^~~~~~~~~~ main.cpp:38:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(s); i++){ ~^~~~~~~~~~ main.cpp:27:6: warning: unused variable 'num' [-Wunused-variable] int num =0, k=0; char c, s[100005], V[100005]; ^~~ main.cpp:27:24: warning: unused variable 'c' [-Wunused-variable] int num =0, k=0; char c, s[100005], V[100005]; ^