Compilare: user.c: In function ‘main’: user.c:22:50: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] mat[i][j]=min(mat[i][j-1],mat[i+(1<<j-1)][j-1]); ^ user.c:12:21: warning: unused variable ‘x’ [-Wunused-variable] int a,b,i,j,n,m,x; ^ user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&n,&m); ^ user.c:17:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&v[i]); ^ user.c:24:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&a,&b); ^