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2010-06-09/100.cpp

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+/*
+date:107/10/13
+author:Chen Yi Jing
+
+如果是奇數做某些事，是偶數就做其他事，有點無聊的題目
+1. i 的值是要用來跑迴圈的不能改變
+2. 題目並沒有說 start 會比 end 小 
+*/
+
+#include<iostream>
+using namespace std;
+int main() {
+    int start = 0, end = 0, tmp = 1, max = 0, value = 0;
+    int temp = 0;
+    int change = 0;
+    while(cin >> start >> end) {
+        if (start > end) {
+            temp = end;
+            end = start;
+            start = temp;
+
+            change = 1;
+        }
+            
+        for (int i = start; i <= end; i++) {
+            value = i;
+            while (value != 1) {
+                if (value % 2 != 0){
+                    value = 3 * value + 1;
+                    tmp++;
+                }
+                else {
+                    value /= 2;
+                    tmp++;
+                }
+            }
+            if(tmp > max)
+                max = tmp; 
+
+            tmp = 1; 
+        }
+
+        if (change == 1) {
+            temp = end;
+            end = start;
+            start = temp;
+        }
+        cout << start << " " << end << " " << max<< endl;
+        max = 0;
+        change = 0;
+    }
+}