Compilare: user.cpp: In function ‘bool Check(int)’: user.cpp:35:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok = false; ^ user.cpp: In function ‘int main()’: user.cpp:77:9: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(s[i]); ^ In file included from /usr/include/c++/5/cstdio:42:0, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:46, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:77:9: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(s[i]); ^ In file included from /usr/include/c++/5/cstdio:42:0, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:46, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:77:18: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(s[i]); ^ In file included from /usr/include/c++/5/cstdio:42:0, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:46, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:75:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &m); ^ user.cpp:77:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s[i]); ^ /tmp/ccYLkgQo.o: In function `main': user.cpp:(.text.startup+0x4b): warning: the `gets' function is dangerous and should not be used.