Compilare: user.cpp: In function ‘int main()’: user.cpp:19:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.in","r",stdin); ^ user.cpp:20:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.out","w",stdout); ^ user.cpp:22:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&n,&m); ^ user.cpp:43:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v,110,stdin); ^ user.cpp:121:52: warning: ‘lmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (rom[i][j]==jul[i][j]&&rom[i][j]!=-1&&rom[i][j]<lmin&&rom[i][j]!=0) ^ user.cpp:97:15: warning: ‘j2’ may be used uninitialized in this function [-Wmaybe-uninitialized] cd[1].y=j2; ^ user.cpp:96:15: warning: ‘j1’ may be used uninitialized in this function [-Wmaybe-uninitialized] cd[1].x=j1; ^ user.cpp:74:15: warning: ‘r2’ may be used uninitialized in this function [-Wmaybe-uninitialized] cd[1].y=r2; ^ user.cpp:73:15: warning: ‘r1’ may be used uninitialized in this function [-Wmaybe-uninitialized] cd[1].x=r1; ^ In file included from /usr/include/stdio.h:934:0, from /usr/include/c++/4.8/cstdio:42, from user.cpp:1: In function ‘char* fgets(char*, int, FILE*)’, inlined from ‘int main()’ at user.cpp:43:27: /usr/include/i386-linux-gnu/bits/stdio2.h:253:58: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer [enabled by default] return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^