【add】笔试-作业帮-180925

Author: imhuay

D-笔试面经/笔试-作业帮-180925.md

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+笔试-作业帮-180925
+===
+- 单选 5，填空 5，编程 2，问答 2
+- 编程不允许跳出页面
+
+Index
+---
+<!-- TOC -->
+
+- [1. 点对距离](#1-点对距离)
+- [2. 扩展型表达式求值](#2-扩展型表达式求值)
+
+<!-- /TOC -->
+
+
+## 1. 点对距离
+
+<div align="center"><img src="../_assets/TIM截图20180925203418.png" height="" /></div>
+<div align="center"><img src="../_assets/TIM截图20180925203432.png" height="" /></div>
+
+**Python**（60）
+- 试了各种情况，不知道哪里有问题
+```python
+from math import ceil, floor
+
+def foo(ax, ay, bx, by):
+    d = ((ax - bx)**2 + (ay - by)**2)**0.5
+    #return round(d, 5)
+    return d
+
+k = int(input())
+n = int(input())
+
+P = []
+for _ in range(n):
+    x, y = list(map(float, input().split()))
+    P.append([x, y])
+
+D = []
+for i in range(n):
+    for j in range(i+1, n):
+        d = foo(P[i][0], P[i][1], P[j][0], P[j][1])
+        D.append(d)
+        
+D.sort()
+#print(D)
+N = len(D) - 1
+#print(N)
+#print(ceil(N * (k / 100)))
+ans = D[ceil(N * (k / 100))]
+#print("%0.5f" % ans)
+print(round(ans, 5))
+#print(ans)
+```
+
+## 2. 扩展型表达式求值
+
+<div align="center"><img src="../_assets/TIM截图20180925203442.png" height="" /></div>
+<div align="center"><img src="../_assets/TIM截图20180925203454.png" height="" /></div>
+<div align="center"><img src="../_assets/TIM截图20180925203504.png" height="" /></div>
+
+**Python**（57.14%）
+- 不能跳出页面，实在不想写这种题，偷鸡过了 57%
+```python
+def bar(s):
+    while "%" in s:
+        i = s.find("%")
+        j = i - 1
+        while s[j].isdigit():
+            j -= 1
+        
+        s = s[:j+1] + str(int(s[j+1: i]) / 100) + s[i+1:]
+    return s
+    
+def foo(s):
+    if "**" in s or "++" in s or "--" in s:
+        return "error"
+    
+    s = bar(s)
+    
+    try:
+        ans = eval(s)
+        if isinstance(ans, int):
+            return "%d" % ans
+        else:
+            return "%0.3f" % ans
+            #return round(ans, 3)
+    except e:
+        return "error"
+
+s = input()
+ans = foo(s)
+#print(bar(s))
+print(ans)
+```