# template for solving 6th problem in russian state exam

Sep 19th, 2019
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1. #include <iostream>
2. #include <vector>
3. #include <cassert>
4. #include <type_traits>
5. #include <sstream>
6. #include <functional>
7.
8. template <typename T>
9. struct Request{
10.     static_assert(std::is_integral<T>::value,"must be integral type");
11.     Request(T l_b = 0, T r_b = 0, T v = 0):
12.             left_border(l_b),
13.             right_border(r_b),
14.             value_to_find(v)
15.     {}
16.     T distanse() const {
17.         return abs(left_border-right_border);
18.     }
19.     const T left_border;
20.     const T right_border;
21.     const T value_to_find;
22. };
23. template <typename T>
24. struct Strategy{
25.     static_assert(std::is_integral<T>::value,"must be integral type");
26.     Strategy(const std::string& name = "Strategy"): _name(name){}
27.     virtual void next(T& value) const = 0;
28.     virtual T next(const T& value) const = 0;
29.     virtual void prev(T& value) const  = 0;
30.     virtual T prev(const T& value) const = 0;
31.     const std::string& name(){
32.         return _name;
33.     }
34. private:
35.     const std::string _name;
36. };
37. template <typename T>
38. struct Forward_Enum_Strategy: public Strategy<T>{
39.     static_assert(std::is_integral<T>::value,"must be integral type");
40.     Forward_Enum_Strategy(): Strategy<T>("Enum_strategy"){}
41.     void next(T& value)const  override {
42.         value++;
43.     }
44.     T next(const T& value) const override {
45.         return value+1;
46.     }
47.     void prev(T& value) const override {
48.         value--;
49.     }
50.     T prev(const T& value) const override{
51.         return value-1;
52.     }
53. };
54. template <typename T>
55. struct Backward_Enum_Strategy: public Strategy<T>{
56.
57. };
58. template<typename T, typename F, typename Action>
59. void for_each_in_range(const Request<T>& request, const Strategy<T>& strategy, F change, Action action){
60.     assert(!(request.left_border > request.right_border && dynamic_cast<const Forward_Enum_Strategy<T>*>(&strategy)));
61.     assert(!(request.left_border < request.right_border && dynamic_cast<const Backward_Enum_Strategy<T>*>(&strategy)));
62.     for(T iterator = request.left_border; iterator <= request.right_border; strategy.next(iterator)){
63.         if(request.value_to_find == change(iterator)){
64.             action(iterator);
65.         }
66.     }
67. }
68. template <typename T, typename F>
69. std::pair<bool, unsigned long long> find_in_range(const Request<T>& request, const Strategy<T>& strategy, F change){
70.     unsigned long long applied_values = 0;
71.     bool success = false;
72.     auto action = [&applied_values, &success](T value){
73.         applied_values++;
74.         success = true;
75.     };
76.     for_each_in_range(request,strategy, change, action);
77.     return std::make_pair(success, applied_values);
78. }
79. template <typename T, typename F>
80. bool find_in_range(const Request<T>& request, const Strategy<T>& strategy, F change){
81.     bool success = false;
82.     auto action = [&success](T value){
83.         success = true;
84.     };
85.     for_each_in_range(request,strategy,change,action);
86.     return success;
87. }
88. template <typename T, typename F>
89. unsigned long long find_in_range(const Request<T>& request, const Strategy<T>& strategy, F change){
90.     unsigned long long applied_values = 0;
91.     auto action = [&applied_values](T value){
92.         applied_values++;
93.     };
94.     for_each_in_range(request, strategy, change, action);
95.     return applied_values;
96. }
97. template <typename T,typename F>
98. T find_first_of(const Request<T>& request, const Strategy<T>& strategy, F change){
99.     for(T iterator = request.left_border; iterator <= request.right_border; strategy.next(ref(iterator))){
100.         if(request.value_to_find == change(iterator)){
101.             return iterator;
102.         }
103.     }
104.     return T();
105. }
106. template <typename T,typename F>
107. T find_last_of(const Request<T>& request, Strategy<T>& strategy, F change){
108.     for(T iterator = request.right_border; iterator >= request.left_border; strategy.prev(iterator)){
109.         if(request.value_to_find == change(iterator)){
110.             return iterator;
111.         }
112.     }
113.     return T();
114. }
115. template <typename T,typename F>
116. std::vector<T> find_all(const Request<T>& request, const Strategy<T>& strategy, F change){
117.     std::vector<T> result;
118.     result.reserve(request.distanse());
119.     auto action = [&result](T value){
120.         result.push_back(value);
121.     };
122.     for_each_in_range(request, strategy, change, action);
123.     return result;
124. }
125. template<typename T>
126. std::vector<int> value_to_digits(T value){
127.     static_assert(std::is_integral<T>::value,"must be integral type");
128.     std::vector<int> digits;
129.     digits.reserve(20);
130.     while(value){
131.         digits.push_back(value%10);
132.         value /= 10;
133.     }
134.     reverse(digits.begin(),digits.end());
135.     return digits;
136. }
137. int main(){
138.     using namespace std;
139.     Request request(1000,9999,1515);
140.     Forward_Enum_Strategy<int> strategy;
141.     auto change = [](long long value){
142.         auto digits = value_to_digits(value);
143.         int a = digits[0] + digits[1];
144.         int b = digits[1] + digits[2];
145.         int c = digits[2] + digits[3];
146.         int prod_a = max(a,max(b,c));
147.         int prod_b = a+b+c - prod_a - min(a,min(b,c));
148.         if(prod_a > prod_b){
149.             return stoi(to_string(prod_b) + to_string(prod_a));
150.         }else{
151.             return stoi(to_string(prod_a) + to_string(prod_b));
152.         }
153.     };
154.     cout << "{ ";
155.     for(auto x: find_all(request,strategy,change)){
156.         cout << x << ", ";
157.     }
158.     cout << "}\n";
159.     return 0;
160. }
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