From 1ede4333f68e2541d0073fb7a9f59280dbe68e2d Mon Sep 17 00:00:00 2001
From: kindofman <43539680+kindofman@users.noreply.github.com>
Date: Sun, 29 Dec 2019 09:33:17 +0300
Subject: [PATCH] Update main.cpp

---
 16-1/main.cpp | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/16-1/main.cpp b/16-1/main.cpp
index 6bf3cd9..b664a33 100644
--- a/16-1/main.cpp
+++ b/16-1/main.cpp
@@ -3,3 +3,76 @@
 Найдите все вхождения шаблона в строку. Длина шаблона – p, длина строки ­– n. Время O(n + p), доп. память – O(p).
 Вариант 1. С помощью префикс-функции (алгоритм Кнута-Морриса-Пратта).
 */
+
+#include <string>
+#include <iostream>
+#include <vector>
+
+using std::cin;
+using std::cout;
+using std::endl;
+using std::vector;
+using std::string;
+
+void print_indices( const vector<int>& indices ) {
+    for ( auto i: indices ) {
+        cout << i << ' ';
+    }
+    cout << endl;
+}
+
+vector<int> prefix_function ( const string& s ) {
+    int n = (int) s.length();
+    vector<int> pi (n);
+    pi[0] = 0;
+    for ( int i = 1; i < n; ++i ) {
+        int j = pi[i-1];
+        while ( j > 0 && s[i] != s[j] ) {
+            j = pi[j-1];
+        }
+        if ( s[i] == s[j] ) { ++j; }
+        pi[i] = j;
+    }
+    return pi;
+}
+
+vector<int> prefix_function_mod( const string& templ, const string& s, vector<int> pi_templ ) {
+    int n = (int) s.length();
+    vector<int> pi (n+1);
+    int prev = 0;
+    for ( int i = 0; i < n; ++i ) {
+        int j = prev;
+        while ( j > 0 && s[i] != templ[j] ) {
+            j = pi_templ[j-1];
+        }
+        if ( s[i] == templ[j] ) { ++j; }
+        pi[i] = j;
+        prev = j;
+    }
+    return pi;
+}
+
+
+vector<int> count_substring( const string& templ, const string& str ) {
+    vector<int> result;
+    vector<int> prefixes_templ = prefix_function( templ );
+    vector<int> prefixes = prefix_function_mod( templ, str, prefixes_templ );
+    int size_templ = (int) templ.size();
+    for ( int i = 0; i < prefixes.size(); ++i ) {
+        if ( prefixes[i] == size_templ ) { result.push_back( i - size_templ + 1 ); }
+    }
+    return result;
+}
+
+
+int main() {
+    string templ;
+    string str;
+    std::getline( cin, templ );
+    std::getline( cin, str );
+    vector<int> indices = count_substring( templ, str );
+    print_indices( indices );
+    return 0;
+}
+
+