修改文件结构。

POP/06/Optional05.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int digits[5][2];
+int best1 = 100000, best2 = 10000;
+
+void pickNext(int layer, int goal, int alreadyPicked,int* best) {
+    int i = 0;
+    if (layer == 6) {
+        if (abs(alreadyPicked - goal) < abs(*best - goal)) {
+            *best = alreadyPicked;
+        }
+    }
+    else {
+        for (;i < 5; i++) {
+            if (digits[i][1] == 0) {
+                digits[i][1] = 1;
+                pickNext(layer + 1, goal, alreadyPicked * 10 + digits[i][0], best);
+                digits[i][1] = 0;
+            }
+        }
+    }
+}
+
+int main() {
+    int input, i;
+    scanf("%d", &input);
+    if (input < 10000 || input > 99999) {
+        printf("Not a 5-digit number!");
+        return 0;
+    }
+    else {
+        for (i = 4; i >= 0; i--) {
+            digits[i][0] = input % 10;
+            input /= 10;
+        }
+        pickNext(1, 40000, 0, &best1);
+        pickNext(1, 60000, 0, &best2);
+        printf("%d %d", best1, best2);
+    }
+    return 0;
+}