Compilare: user.cpp: In function ‘void Read()’: user.cpp:20:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(s); n = strlen(s); ^ 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:20:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(s); n = strlen(s); ^ 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:20:11: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(s); n = strlen(s); ^ 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: In function ‘int Task2()’: user.cpp:49:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(upd[i].x == lis.size()) ^ user.cpp: In function ‘void Read()’: user.cpp:19:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &k); ^ user.cpp:20:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); n = strlen(s); ^ /tmp/cc5I3qEs.o: In function `Read()': user.cpp:(.text+0x1d): warning: the `gets' function is dangerous and should not be used.