题目链接:点击打开链接
Fxx and string
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/65536 K (Java/Others)
Total Submission(s): 97 Accepted Submission(s): 47
Problem Description
Young theoretical computer scientist Fxx get a string which contains lowercase letters only.
The string S
contains
n
lowercase letters
S
1
S
2
…S
n![]()
.Now Fxx wants to know how many three tuple
(i,j,k)
there are which can meet the following conditions:
1、 i,j,k
are adjacent into a geometric sequence.
2、 S
i
=
'
y
'
,S
j
=
'
r
'
,S
k
=
'
x
'.
3.Either j|i or j|k
The string S
1、 i,j,k
2、 S
3.Either j|i or j|k
Input
In the first line, there is an integer
T(1≤T≤100)
indicating the number of test cases.
T
lines follow, each line contains a string, which contains only lowercase letters.(The length of string will not exceed
10000
).
T
Output
For each case, output the answer.
Sample Input
2 xyyrxx yyrrxxxxx
Sample Output
0 2
Source
问题描述
青年理论计算机科学家Fxx得到了一个只包含小写字母的字符串。 字符串的长度为n,下标从1开始,第i位的字母为si,现在Fxx想知道有多少三元组(i,j,k)满足下列条件 1、i,j,k三个数成等比数列 2、si='y',sj='r',sk='x' 3.i/j和k/j中必须有整数
输入描述
第一行一个整数T(1≤T≤100)表示数据组数。 接下来T行,每行一个仅包含小写字母的字符串(字符串长度不超过10000)
输出描述
输出共T行。
每行一个整数表示答案。
输入样例
2 xyyrxx yyrrxxxxx
输出样例
0 2思路:刚开始只考虑了公比大于 1 的情况,唉
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
char str[10010];
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
scanf("%s",str+1);
int len=strlen(str+1);
int ans=0;
for(int i=1;i*4<=len;i++)
{
if(str[i]=='y')
{
int cnt=2;
while(i*cnt*cnt<=len)
{
if(str[i*cnt]=='r'&&str[i*cnt*cnt]=='x')
ans++;
cnt++;
}
}
if(str[i]=='x')
{
int cnt=2;
while(i*cnt*cnt<=len)
{
if(str[i*cnt]=='r'&&str[i*cnt*cnt]=='y')
ans++;
cnt++;
}
}
}
printf("%d\n",ans);
}
return 0;
}