Compilare: user.cpp: In function ‘int bsv(long long unsigned int, int)’: user.cpp:22:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + p <= V[j][0] && V[j][i + p] <= x) ^ user.cpp: In function ‘int secv(int)’: user.cpp:61:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= V[1][0]; ++ i) ^ user.cpp:33:9: warning: unused variable ‘p’ [-Wunused-variable] int p, ok, i, j, m; ^ user.cpp: In function ‘int main()’: user.cpp:89:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:95:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ /tmp/ccr5osWS.o: In function `main': user.cpp:(.text.startup+0x80): warning: the `gets' function is dangerous and should not be used.