Compilare: user.cpp: In function ‘int main()’: user.cpp:12:39: warning: variable ‘mi’ set but not used [-Wunused-but-set-variable] int n,m,i,j,q,p,xs,ys,xf,yf,st,dr,mi,la,lx,ly; ^ user.cpp:12:42: warning: unused variable ‘la’ [-Wunused-variable] int n,m,i,j,q,p,xs,ys,xf,yf,st,dr,mi,la,lx,ly; ^ user.cpp:12:45: warning: variable ‘lx’ set but not used [-Wunused-but-set-variable] int n,m,i,j,q,p,xs,ys,xf,yf,st,dr,mi,la,lx,ly; ^ user.cpp:12:48: warning: variable ‘ly’ set but not used [-Wunused-but-set-variable] int n,m,i,j,q,p,xs,ys,xf,yf,st,dr,mi,la,lx,ly; ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice3.in","r",stdin); ^ user.cpp:11:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice3.out","w",stdout); ^ user.cpp:13:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n",&n,&m,&q); ^ user.cpp:16:22: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(si[i]+1); ^ user.cpp:44:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&xs,&ys,&xf,&yf); ^ 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 ‘int main()’ at user.cpp:16:22: /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/ccI9t2YD.o: In function `main': user.cpp:(.text.startup+0x8d): warning: the `gets' function is dangerous and should not be used.