Compilare: user.c:4:83: warning: built-in function ‘log’ declared as non-function [enabled by default] unsigned char mat[lim][lim],l[lim][lim],c[lim][lim],rmq[lim][lim][loglim][loglim],log[loglim]; ^ user.c: In function ‘main’: user.c:20:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d\n",&n,&m,&q); ^ user.c:23:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&mat[i][j]); ^ user.c:36:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"\n"); ^ user.c:48:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&x,&y,&i,&j); ^