Find Q
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/131072 K (Java/Others)
Total Submission(s): 636 Accepted Submission(s): 314
Problem Description
Byteasar is addicted to the English letter 'q'. Now he comes across a string S consisting of lowercase English letters.
He wants to find all the continous substrings of S, which only contain the letter 'q'. But this string is really really long, so could you please write a program to help him?
Input
The first line of the input contains an integer T(1≤T≤10), denoting the number of test cases.
In each test case, there is a string S, it is guaranteed that S only contains lowercase letters and the length of S is no more than 100000.
Output
For each test case, print a line with an integer, denoting the number of continous substrings of S, which only contain the letter 'q'.
Sample Input
2
qoder
quailtyqqq
Sample Output
1
7
Source
BestCoder Round #88
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题解：找出S的所有仅包含字母'q'的连续子串的数目。
就是cnt*(cnt+1)/2 累加呗...
AC代码：
#include<stdio.h>
#include<string.h>
const int N = 100000+20;
char S[N];
int main(){
int t;
scanf("%d",&t);
while(t--)
{
scanf("%s",S);
long long cnt=0,ans=0;
int L=strlen(S);
for(int i=0;i<=L;i++)
{
if(S[i]=='q')
{
cnt++;
}
else if(S[i]!='q'&&S[i-1]=='q')
{
ans+=cnt*(cnt+1)/2;
cnt=0;
}
}
printf("%lld\n",ans);
}
return 0;
}