Compilare: user.cpp: In function ‘int main()’: user.cpp:21:25: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] for(i=1; i<=n; ++i) gets(A[i]+1); ^ 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:21:25: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] for(i=1; i<=n; ++i) gets(A[i]+1); ^ 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:21:36: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] for(i=1; i<=n; ++i) gets(A[i]+1); ^ 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:17:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxa.in", "r", stdin); ^ user.cpp:18:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxa.out", "w", stdout); ^ user.cpp:20:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d\n", &n, &m, &L0, &C0, &L1, &C1); ^ user.cpp:21:37: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1; i<=n; ++i) gets(A[i]+1); ^ /tmp/ccy2MBMB.o: In function `main': user.cpp:(.text.startup+0xa8): warning: the `gets' function is dangerous and should not be used.