Compilare: user.c:5:71: warning: built-in function ‘log’ declared as non-function [enabled by default] unsigned char a[MAX][MAX],b[MAX][MAX],c[MAX][MAX],r[MAX][MAX][10][10],log[250]; ^ user.c: In function ‘main’: user.c:76:19: warning: unused variable ‘k’ [-Wunused-variable] int n,m,q,i,j,k,lmax,x1,x2,y1,y2,l,pas; ^ user.c:78:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d ",&n,&m,&q); ^ user.c:88:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&x1,&y1,&x2,&y2); ^