Compilare: user.c: In function ‘main’: user.c:74:5: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration] close(fi); ^ user.c:27:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &m, &n); ^ user.c:29:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d", &a[i]); ^ user.c:32:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d", &b[i]); ^