1sting
Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 7573 Accepted Submission(s): 2945
Problem Description
You will be given a string which only contains ‘1’; You can merge two adjacent ‘1’ to be ‘2’, or leave the ‘1’ there. Surly, you may get many different results. For example, given 1111 , you can get 1111, 121, 112,211,22. Now, your work is to find the total number of result you can get.
Input
The
first line is a number n refers to the number of test cases. Then n
lines follows, each line has a string made up of ‘1’ . The maximum
length of the sequence is 200.
Output
The output contain n lines, each line output the number of result you can get .
Sample Input
3 1 11 11111
Sample Output
1 2 8
题目大意
给你一个仅包含‘1‘的字符串; 你可以将两个相邻的“1”合并为“2”,或将“1”保留。例如,给定1111,可以获得1111,121,112,211,22。 要求计算出可能的结果数量。
题目分析
当只有一个‘1’的时候,只有一种情况
有两个‘1’的时候,有两种情况,一种是 11 一种是 2
n>2的时候,我们可以在n-1的基础上在字符串的末尾加上一个 1
也可以在n-2的基础上加上一个2
所以得出递推公式:
f(n) = f(n-1) + f (n-2)
代码
#include<bits/stdc++.h> using namespace std; int n,i; string x; string bigadd(string a,string b) { int jin=0,i; char ai,bi; string anss=a; int lena=a.size(); int lenb=b.size(); int lenmax=max(lena,lenb); int p=lena-1; int q=lenb-1; for(i=lenmax-1;i>=0;i--) { if(p<0) ai=‘0‘; else ai=a[p]; if(q<0) bi=‘0‘; else bi=b[q]; anss[i]=((ai-‘0‘+bi-‘0‘+jin)%10)+‘0‘; jin=(ai-‘0‘+bi-‘0‘+jin)/10; p--; q--; } if(jin) { char x=jin+‘0‘; anss=x+anss; } return anss; } int main() { string a[205]; a[1]="1"; a[2]="2"; for(i=3;i<205;++i) a[i]=bigadd(a[i-1],a[i-2]); scanf("%d",&n); for(i=1;i<=n;i++) { cin>>x; cout<<a[x.size()]<<endl; } return 0; }
原文地址:https://www.cnblogs.com/dyhaohaoxuexi/p/11335349.html