Compilare: user.cpp: In function ‘void lmax0()’: user.cpp:29:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,nr,A,l=0; ^ user.cpp:29:15: warning: unused variable ‘nr’ [-Wunused-variable] int i,j,k,nr,A,l=0; ^ user.cpp: In function ‘void citire()’: user.cpp:23:27: 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:25:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(b[i]+1); ^ user.cpp: In function ‘int main()’: user.cpp:64:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bmatrix.in","r",stdin); ^ user.cpp:65:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bmatrix.out","w",stdout); ^ 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* gets(char*)’, inlined from ‘void citire()’ at user.cpp:25:17: /usr/include/i386-linux-gnu/bits/stdio2.h:230:28: warning: call to ‘__gets_warn’ declared with attribute warning: please use fgets or getline instead, gets can't specify buffer size [enabled by default] return __gets_warn (__str); ^ /tmp/cca1Xcby.o: In function `citire()': user.cpp:(.text+0x47): warning: the `gets' function is dangerous and should not be used.