Codeforce_828C_String Reconstruction_字符串处理

最新推荐文章于 2020-12-05 11:16:21 发布

原创最新推荐文章于 2020-12-05 11:16:21 发布 · 428 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#c语言 #string

水题同时被 3 个专栏收录

111 篇文章

订阅专栏

32 篇文章

订阅专栏

模拟

27 篇文章

订阅专栏

本文介绍了一个字符串重构问题，根据已知的子串及其在目标字符串中的出现位置，寻找字典序最小的可能字符串。通过逐字符填充的方式，确保满足所有条件的同时达到最小字典序的要求。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

String Reconstruction

Ivan had string s consisting of small English letters. However, his friend Julia decided to make fun of him and hid the string s. Ivan preferred making a new string to finding the old one.

Ivan knows some information about the string s. Namely, he remembers, that string ti occurs in string s at least ki times or more, he also remembers exactly ki positions where the string ti occurs in string s: these positions are xi, 1, xi, 2, …, xi, ki. He remembers n such strings ti.

You are to reconstruct lexicographically minimal string s such that it fits all the information Ivan remembers. Strings ti and string s consist of small English letters only.

Input
The first line contains single integer n (1 ≤ n ≤ 105) — the number of strings Ivan remembers.

The next n lines contain information about the strings. The i-th of these lines contains non-empty string ti, then positive integer ki, which equal to the number of times the string ti occurs in string s, and then ki distinct positive integers xi, 1, xi, 2, …, xi, ki in increasing order — positions, in which occurrences of the string ti in the string s start. It is guaranteed that the sum of lengths of strings ti doesn’t exceed 106, 1 ≤ xi, j ≤ 106, 1 ≤ ki ≤ 106, and the sum of all ki doesn’t exceed 106. The strings ti can coincide.

It is guaranteed that the input data is not self-contradictory, and thus at least one answer always exists.

Output
Print lexicographically minimal string that fits all the information Ivan remembers.

Sample Input
Input
3
a 4 1 3 5 7
ab 2 1 5
ca 1 4
Output
abacaba
Input
1
a 1 3
Output
aaa
Input
3
ab 1 1
aba 1 3
ab 2 3 5
Output
ababab
Source
Codeforces Round #423 (Div. 2, rated, based on VK Cup Finals)

题意: 给你一个字符串,告诉你它在原字符串中的位置,且保证得到的原字符串,字典序最小.

蛇皮模拟,不优化,会超时

#include<bits/stdc++.h>
using namespace std;
char s1[5000005];
char s2[999999];
int main()
{
    int n,m,i,j;
    while(cin>>n)
    {
        memset(s1,' ',sizeof(s1));
        int mm=0;
        while(n--)
        {
            scanf("%s %d",s2,&m);
            int len=strlen(s2);
            int u=1;
            while(m--)
            {
                int pos;
                scanf("%d",&pos);
                for(u=max(u,pos);u<pos+len;u++)
                    s1[u]=s2[u-pos];
                 mm=max(mm,pos+len);
            }
        }
        for(i=1;i<mm;i++) if(s1[i]==' ')  s1[i]='a';
        for(i=1;i<mm;i++) printf("%c",s1[i]);
        puts("");
    }
    return 0;
}