Description
Let S = s1 s2...s2n be a well-formed string of parentheses. S can be encoded in two different ways:
q By an integer sequence P = p1 p2...pn where pi is the number of left parentheses before the ith right parenthesis in S (P-sequence).
q By an integer sequence W = w1 w2...wn where for each right parenthesis, say a in S, we associate an integer which is the number of right parentheses counting from the matched left parenthesis of a up to a. (W-sequence).
Following is an example of the above encodings:
S (((()()())))
P-sequence 4 5 6666
W-sequence 1 1 1456
Write a program to convert P-sequence of a well-formed string to the W-sequence of the same string.
Input
The first line of the input contains a single integer t (1 <= t <= 10), the number of test cases, followed by the input data for each test case. The first line of each test case is an integer n (1 <= n <= 20), and the second line is the P-sequence of a well-formed
string. It contains n positive integers, separated with blanks, representing the P-sequence.
Output
The output file consists of exactly t lines corresponding to test cases. For each test case, the output line should contain n integers describing the W-sequence of the string corresponding to its given P-sequence.
Sample Input
2
6
4 5 6 6 6 6
9
4 6 6 6 6 8 9 9 9
Sample Output
1 1 1 4 5 6
1 1 2 4 5 1 1 3 9
水题,因为没注意空格错了一会。
题意就是告诉第i个右括号前有几个左括号
打印第i个括号,前有几个匹配的括号
思路用的:STL队列,逆匹配
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>
#include <queue>
using namespace std;
char s[1000];
int main()
{
std::ios::sync_with_stdio(false);
int t,n,i,j,a[30],b[30],l;
cin>>t;
while(t--)
{
cin>>n;
l = 0;
for(i = 0;i<n;i++)
{
cin>>a[i];
b[i] = a[i] + i;
}
for( i = 0;i<a[0];i++)
s[i] = '(';
s[i] = ')';
l = i;
l++;
for(i = 1;i<n;i++)
{
for(j = 0;j<a[i]-a[i-1];j++)
s[l++] = '(';
s[l++] = ')';
}
s[l] = '\0';
queue<char>q;
int co = 0;
for(i = 0;i<n;i++)
{
q.push(s[b[i]]);
co = 0;
for(j = b[i]-1;j>=0;j--)
{
if(q.empty())
break;
if(s[j]==')')
q.push(s[j]);
else if(s[j]=='(' && q.front()==')')
{
q.pop();
co++;
}
}
if(i<n-1)
printf("%d ",co);
else
printf("%d\n",co);
}
}
return 0;
}
POJ-1068 Parencodings,布布扣,bubuko.com
POJ-1068 Parencodings
原文:http://blog.csdn.net/wjw0130/article/details/32338427