Compilare: user.c: In function ‘main’: user.c:19:11: warning: implicit declaration of function ‘abs’ [-Wimplicit-function-declaration] x = dist[i] + c[i] + abs(xk2[i] - xk1[j]) + abs(yk2[i] - yk1[j]); ^ user.c:8:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld", &t); ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld", &n, &m); ^ user.c:12:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld%lld%lld%lld", &xk1[i], &yk1[i], &xk2[i], &yk2[i], &c[i]); ^