zoukankan      html  css  js  c++  java
  • uva 12086

    A potentiometer, or potmeter for short, is anelectronic device with a variable electric resistance. It has two terminals andsome kind of control mechanism (often a dial, a wheel or a slide) with whichthe resistance between the terminals can be adjusted from zero (no resistance)to some maximum value. Resistance is measured in Ohms, and when two or moreresistors are connected in series (one after the other, in a row), the totalresistance of the array is the sum of the resistances of the individualresistors.

    In this problem we will consider an array of Npotmeters, numbered 1 to N from left to right. The left terminalof some potmeter numbered x is connected to the right terminal ofpotmeter x-1, and its right terminal to the left terminal of potmeter x+1.The left terminal of potmeter 1 and the right terminal of potmeter Nare not connected.

    Initially all the potmeters are set to some valuebetween 0 and 1000 Ohms. Then we can do two things:

    • Set one of the potmeters to another     value.
    • Measure the resistance between     two terminals anywhere in the array.
    Input

    The input consists less than 3cases. Each case starts with N, the number of potmeters in the array, ona line by itself. N can be as large as 200000. Each of next N linescontains one numbers between 0 and 1000, the initial resistances of thepotmeters in the order 1 to N. Then follow a number of actions,each on a line by itself. The number of actions can be as many as 200000. Thereare three types of action:

    • "S x r" - set     potmeter x to r Ohms. x is a valid potmeter number     and r is between 0 and 1000.
    • "M x y" - measure the     resistance between the left terminal of potmeter x and the right     terminal of potmeter y. Both numbers will be valid and x is     smaller than or equal to y.
    • "END" - end of this     case. Appears only once at the end of a list of actions.

    A case with N=0 signalsthe end of the input and it should not be processed.

    Output

    For each case in the input producea line "Case n:", where n is the case number, starting from 1.
    For each measurement in the input, output a line containing one number: themeasured resistance in Ohms. The actions should be applied to the array ofpotmeters in the order given in the input.
    Print a blank line between cases.

    Warning: Input Data is prettybig (~  8 MB) so use faster IO.


    Sample Input                            Output for Sample Input

       

     

    3

     

    100

     

    100

     

    100

     

    M  1 1

     

    M  1 3

     

    S  2 200

     

    M  1 2

     

    S  3 0

     

    M  2 3

     

    END

     

    10

     

    1

     

    2

     

    3

     

    4

     

    5

     

    6

     

    7

     

    8

     

    9

     

    10

     

    M  1 10

     

    END

     

    0

     
     
     

    Case  1:

     

    100

     

    300

     

    300

     

    200

     

     

     

    Case  2:

     

    55

     1 #include <stdio.h>
     2 #include <string.h>
     3 #include <stdlib.h>
     4 #include <iostream>
     5 int b[300000],a[300000],n;
     6 int lowbit(int x)
     7 {
     8     return x&(-x);
     9 }
    10 int sum(int x)
    11 {
    12     int sum=0;
    13     while(x>0)
    14     {
    15         sum=sum+b[x];
    16         x=x-lowbit(x);
    17     }
    18     return sum;
    19 }
    20 void add(int i,int x)
    21 {
    22     while(i<=n)
    23     {
    24         b[i]=b[i]+x;
    25         i=i+lowbit(i);
    26     }
    27 }
    28 int main()
    29 {
    30     int t=1;
    31     int cx=0;
    32     while(scanf("%d",&n)!=EOF&&n)
    33     {
    34         if(cx)
    35             puts("");
    36         memset(b,0,sizeof(b));
    37         int  d,e,x;
    38         char c[10];
    39         for(int i=1; i<=n; i++)
    40         {
    41             scanf("%d",&a[i]);
    42             add(i,a[i]);
    43         }
    44         printf("Case %d:
    ",t++);
    45         while(1)
    46         {
    47             scanf("%s",c);
    48             if(strcmp(c,"END")==0)
    49                 break;
    50             if(c[0]=='M')
    51             {
    52                 scanf("%d%d",&d,&e);
    53                 printf("%d
    ",sum(e)-sum(d-1));
    54             }
    55             if(c[0]=='S')
    56             {
    57                 scanf("%d%d",&d,&e);
    58                 x=e-a[d];
    59                 a[d]=e;
    60                 add(d,x);
    61             }
    62         }
    63         cx=n;
    64     }
    65     return 0;
    66 }
  • 相关阅读:
    Windows 8.1 应用开发文章汇总
    演绎事件委托
    Azure China
    Orchard 刨析:导航篇
    为ASP.NET MVC应用程序使用高级功能
    兼容Mono的下一代云环境Web开发框架ASP.NET vNext
    商品导航菜单
    纳斯达克对经济泡沫的定义是:当交易价格远大于内在价值的时候,就称为泡沫(转)
    当一个低级问题,第一次解决时,你会感受到成就;第二次解决时,你感受到责任,第三次解决时,你可能更多的感受到无力(转)
    互联网组织的未来:剖析GitHub员工的任性之源(转)
  • 原文地址:https://www.cnblogs.com/tianmin123/p/4746222.html
Copyright © 2011-2022 走看看