Compilare: user.cpp: In function ‘bool ok(int)’: user.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<strlen(b); j++) ~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(b); i++) ~^~~~~~~~~~ user.cpp:26:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i!=(strlen(b)-1)) p=p%100007;} ~^~~~~~~~~~~~~~~ user.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=strlen(a)-strlen(b); i++) ~^~~~~~~~~~~~~~~~~~~~~