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+\begin{cprog}
+typedef struct QuadTree {
+ double Data;
+ struct QuadTree
+ *Children[4];
+} QT;
+
+void Sum3rdChildren(QT *T,
+ double *Result) {
+ double Ret;
+ if (T == 0) { Ret = 0;
+ } else {
+ QT *Child3 =
+ T[0].Children[3];
+ double V;
+ Sum3rdChildren(Child3,
+ &V);
+ Ret = V + T[0].Data;
+ }
+ *Result = Ret;
+}
+\end{cprog}
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