Compilare: user.cpp: In function ‘int main()’: user.cpp:48:21: warning: unused variable ‘k’ [-Wunused-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r; ^ user.cpp:48:43: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r; ^ user.cpp:46:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in","r",stdin); ^ user.cpp:47:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out","w",stdout); ^ user.cpp:49:50: 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,&m,&x,&y,&x1,&y1); ^ user.cpp:56:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&(v[i][j])); ^