Compilare: main.cpp: In function 'bool check(char*, int)': main.cpp:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(it < strlen(s[i])) ~~~^~~~~~~~~~~~~~ main.cpp:26:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k[itp]==s[i][it] && itp<strlen(k)) ~~~^~~~~~~~~~ main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ku==strlen(k)) ~~^~~~~~~~~~~