Compilare: user.c: In function ‘main’: user.c:104:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d %d %d", &N, &M, &start.l, &start.c, &finish.l, &finish.c); ^ user.c:107:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &tree[i][j]); ^ user.c:115:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out", "w", stdout); ^