竟然会超时,WHY?
题目:http://acm.timus.ru/problem.aspx?space=1&num=1209
这样写会超时?有些搞不明白了。。
大伙看看是什么原因?
也顺便说说有没有什么更好更快的方法。。
- C# code
using System;namespace ConsoleApplication1{ class Program { static void Main(string[] args) { int count = int.Parse(Console.ReadLine()); long[] num = new long[count]; for(int i=0;i<count;i++) num[i] = long.Parse(Console.ReadLine()); string result = string.Empty; DateTime dt1 = DateTime.Now; foreach (long n in num) result += ZeroOrOne(n) + " "; Console.Write(result.Trim()); } static int ZeroOrOne(long number) { double d = Math.Sqrt((number<<1) - 1.75) + 0.5; if (d - (long)d == 0) return 1; return 0; } }}
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友情帮顶……
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sf
帮顶;
回去再看看
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只有一个3楼。
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先帮顶
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好玩的题目,有空了试试
1, 10, 100, 1000...
Time Limit: 1.0 second
Memory Limit: 16 MB
Let's consider an infinite sequence of digits constructed of ascending powers of 10 written one after another. Here is the beginning of the sequence: 110100100010000… You are to find out what digit is located at the definite position of the sequence.
Input
There is the only positive integer number N in the first line, N < 65536. The i-th of N left lines contains the positive integer Ki — the number of position in the sequence. It's given that Ki < 231.
Output
You are to output N digits 0 or 1 separated with a space. More precisely, the i-th digit of output is to be equal to the Ki-th digit of described above sequence.
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哪个地方超时?
for(int i=0;i<count;i++)
num[i] = long.Parse(Console.ReadLine());
这里就很费时间的
其余不清楚
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这样就OK了:(LZ可能是字符串操作太费时了)
- C# code
using System;class Program{ static void Main() { int count = int.Parse(Console.ReadLine()); long[] num = new long[count]; for(int i=0; i < count; i++) { num[i] = long.Parse(Console.ReadLine()); } foreach (long n in num) { Console.Write(ZeroOrOne(n)); Console.Write(" "); } } static int ZeroOrOne(long number) { double d = Math.Sqrt((number<<1) - 1.75) + 0.5; return d == (long)d ? 1 : 0; }}
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好像输入的数字一大就超时。小数字没有问题
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这样更简单,没有必要开一个数组保存输入,边输入边输出就可以了:
- C# code
using System;class Program{ static void Main() { int count = int.Parse(Console.ReadLine()); for(int i = 0; i < count; i++) { Console.Write(ZeroOrOne(long.Parse(Consoleguration::
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没有必要用 long,用 uint 就够了:
- C# code
using System;class Program{ static void Main() { int count = int.Parse(Console.ReadLine()); for(int i = 0; i < count; i++) { Console.Write(ZeroOrOne(uint.Parse(Console.ReadLine()))); Console.Write(" "); } } static int ZeroOrOne(uint number) { double d = Math.Sqrt((number<<1) - 1.75) + 0.5; return d == (uint)d ? 1 : 0; }}
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看看
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没有必要用字符串相加,得到结果时立即输出好了。
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如果不想要最后一个空格,加上 if (i < count - 1) 就好了:
- C# code
using System;class Program{ static void Main() { int count = int.Parse(Console.ReadLine()); for(int i = 0; i < count; i++) { Console.Write(ZeroOrOne(uint.Parse(Console.ReadLine()))); if (i < count - 1) Console.Write(" "); } } static int ZeroOrOne(uint number) { double d = Math.Sqrt((number<<1) - 1.75) + 0.5; return d == (uint)d ? 1 : 0; }}