Compilare: user.cpp: In function ‘void bfs(int, int, int)’: user.cpp:28:9: warning: unused variable ‘nrx’ [-Wunused-variable] int nrx=0; ^ user.cpp: In function ‘int main()’: user.cpp:108:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d\n %d %d\n",&p,&n,&m); ^ user.cpp:109:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(c+1,kmax+4,in); ^ user.cpp:115:32: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v[i]+1,nmax+4,in); ^ In file included from /usr/include/stdio.h:936:0, from /usr/include/c++/5/cstdio:42, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:46, from user.cpp:1: In function ‘char* fgets(char*, int, FILE*)’, inlined from ‘int main()’ at user.cpp:109:25: /usr/include/bits/stdio2.h:261:58: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^