Compilare: user.c: In function ‘main’: user.c:20:11: warning: implicit declaration of function ‘abs’ [-Wimplicit-function-declaration] x = dist[i] + c[i] + abs(x2[i] - x1[j]) + abs(y2[i] - y1[j]); ^ user.c:9:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t); ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:13:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d%d%d", &x1[i], &y1[i], &x2[i], &y2[i], &c[i]); ^