SUBSTR - Xâu con
Tác giả: ll931110
Ngôn ngữ: C++
//#pragma comment(linker, "/STACK:16777216")
#include <algorithm>
#include <bitset>
#include <cmath>
#include <ctime>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <deque>
#include <fstream>
#include <functional>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <stack>
#include <queue>
#include <vector>
#include <utility>
using namespace std;
string text,pattern;
int f[1000010];
void build(string pattern)
{
f[0] = -1;
for (int i = 1; i < pattern.size(); i++)
{
int j = f[i - 1];
for (; ;)
{
if (pattern[i] == pattern[j + 1])
{
f[i] = j + 1; break;
}
if (j < 0)
{
f[i] = -1; break;
}
j = f[j];
}
}
}
void KMP(string text)
{
int i = 0,j = -1;
for (; ;)
{
if (i == text.size()) return;
if (text[i] == pattern[j + 1])
{
i++; j++;
if (j >= pattern.size() - 1)
{
printf("%d ", i + 1 - pattern.size()); j = f[j];
}
}
else if (j >= 0) j = f[j];
else i++;
}
}
int main()
{
// freopen("substr.in","r",stdin);
// freopen("substr.ou","w",stdout);
cin >> text >> pattern;
build(pattern);
KMP(text);
}