tests/dp/edit_distance.test.cpp

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Last update: 2024-04-03 22:46:30+09:00
Problem: https://onlinejudge.u-aizu.ac.jp/problems/DPL_1_E

Depends on

Code

#define PROBLEM "https://onlinejudge.u-aizu.ac.jp/problems/DPL_1_E"

#include <bits/stdc++.h>
#include "ugilib/base/constants.hpp"
#include "ugilib/base/definitions.hpp"
#include "ugilib/dp/edit_distance.hpp"

using namespace std;

// debug settings
// #define DEBUG
#ifdef DEBUG
// debug input
string _INPUT = R"(
5
1 2 3 4 5
)";
auto _cin = stringstream(_INPUT.substr(1)); // remove '\n' at _INPUT[0]
#else
// standard input
auto& _cin = cin;
#endif

// speed up
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

// reader
struct rd {
    // T
    template<typename T> static T i() { T x; _cin >> x; return x; }  // T item
    // vector<T>
    template<typename T> static vector<T> v(int n) {vector<T> v(n); rep(i, n) _cin >> v[i]; return v;}  // vector<T>
    // vector<pair<T, T>>
    template<typename T> static vector<pair<T, T>> vp(int n) {vector<pair<T, T>> v(n); rep(i, n) _cin >> v[i].first >> v[i].second; return v;}  // vector<pair<T, T>>
    // tuple
    template<typename... Args> static tuple<Args...> t() {
        tuple<Args...> values;
        apply([](auto&... args) { ((_cin >> args), ...); }, values);
        return values;
    }
};

// debug print utility
namespace deb {
    #include <cxxabi.h>
    // demangle type name
    string demangle(const char* name) {
        int status = -4;
        unique_ptr<char, void(*)(void*)> res{
            abi::__cxa_demangle(name, NULL, NULL, &status),
            free
        };
        return (status == 0) ? string(res.get()) : name ;
    }
    // meta functions for type traits
    template<typename T>
    constexpr bool isArithmeticContainer() { return is_arithmetic<typename T::value_type>::value; }
    // for SFINAE
    template<typename T, typename = void> struct has_key_and_mapped_type : false_type {};
    template<typename T> struct has_key_and_mapped_type<T, void_t<typename T::key_type, typename T::mapped_type>> : true_type {};
    // for map or unordered_map
    template<typename T>
    constexpr bool isMapLike() { return has_key_and_mapped_type<T>::value; }

    // for values
    template<typename T, typename enable_if<is_arithmetic<T>::value, nullptr_t>::type = nullptr>
    void p(const T& x) { cout << x << " "; }
    // for pairs
    template <typename T, typename S>
    void p(const pair<T, S>& _p){ p(_p.first); p(_p.second); cout << endl; }
    // for string
    void p(const string& s) { cout << s << endl; }
    // for containers
    template<typename T,  typename enable_if<!is_arithmetic<T>::value, nullptr_t>::type = nullptr>
    void p(const T& container) {
        // map and unordered_map
        if constexpr (isMapLike<T>()) {
            cout << demangle(typeid(T).name()) << ":" << endl;
            for (const auto& kv : container) {
                cout << "[" << kv.first << "] => ";
                p(kv.second);
                if constexpr (is_arithmetic_v<typename T::mapped_type>) cout << endl;
            }
        // vector or set or others
        } else {
            if constexpr (!isArithmeticContainer<T>()) cout << demangle(typeid(T).name()) << ":" << endl;
            for (auto it = begin(container); it != end(container); ++it) {
                p(*it);
            }
            if constexpr (isArithmeticContainer<T>()) cout << endl;
        }
    }
};  // namespace deb

int main() {
    auto& cin = _cin;
    // speed up io
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    // code
    string s1 = rd::i<string>();
    string s2 = rd::i<string>();

    vector<char> v1(all(s1)), v2(all(s2));
    auto dp = ugilib::edit_distance(v1, v2);
    cout << dp.back().back() << endl;

    // deb::p(dp);

    return 0;
}

#line 1 "tests/dp/edit_distance.test.cpp"
#define PROBLEM "https://onlinejudge.u-aizu.ac.jp/problems/DPL_1_E"

#include <bits/stdc++.h>
#line 2 "ugilib/base/definitions.hpp"

using ll = long long;
using ull = unsigned long long;
using ld = long double;
#define rep(i, n) for(size_t i = 0; i < n; i++)  // rep macro
#define all(v) begin(v), end(v)  // all iterator
#line 3 "ugilib/base/constants.hpp"

namespace ugilib::constants {
    template<typename T>
    inline constexpr T INF = std::numeric_limits<T>::max() / 2;
} // namespace ugilib::constants

const ll INF = ugilib::constants::INF<ll>;
#line 4 "ugilib/dp/edit_distance.hpp"

using namespace std;

namespace ugilib {
    /**
     * @brief 編集距離
     * @tparam T vectorの要素の型. stringだったらvector<char>で渡す
     * @param v1 vector1
     * @param v2 vector2
     * @return vector<vector<ll>> dp[i][j]: v1のi文字目までとv2のj文字目までの編集距離
     * @note O(nm). n = v1.size(), m = v2.size()
     * @details
     * auto dp = edit_distance(v1, v2);
     * cout << dp[v1.size()][v2.size()] << endl;
     * cout << dp.back().back() << endl;
    */
    template <typename T>
    vector<vector<ll>> edit_distance(const vector<T>& v1, const vector<T>& v2) {
        int n = v1.size();
        int m = v2.size();
        // dp[i][j]: v1のi文字目までとv2のj文字目までの編集距離
        vector<vector<ll>> dp(n+1, vector<ll>(m+1, INF));

        // 空文字列との編集距離
        for (int i = 0; i <= n; i++) dp[i][0] = i;
        for (int j = 0; j <= m; j++) dp[0][j] = j;

        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                dp[i+1][j+1] = min(dp[i][j+1] + 1, dp[i+1][j] + 1);  // v1 or v2どちらか1文字追加
                if (v1[i] == v2[j]) dp[i+1][j+1] = min(dp[i+1][j+1], dp[i][j]);  // v1 and v2両方から1文字追加
                else dp[i+1][j+1] = min(dp[i+1][j+1], dp[i][j] + 1);  // v1 and v2両方から1文字追加し, 片方を変更する
            }
        }

        return dp;
    }
}  // namespace ugilib
#line 7 "tests/dp/edit_distance.test.cpp"

using namespace std;

// debug settings
// #define DEBUG
#ifdef DEBUG
// debug input
string _INPUT = R"(
5
1 2 3 4 5
)";
auto _cin = stringstream(_INPUT.substr(1)); // remove '\n' at _INPUT[0]
#else
// standard input
auto& _cin = cin;
#endif

// speed up
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

// reader
struct rd {
    // T
    template<typename T> static T i() { T x; _cin >> x; return x; }  // T item
    // vector<T>
    template<typename T> static vector<T> v(int n) {vector<T> v(n); rep(i, n) _cin >> v[i]; return v;}  // vector<T>
    // vector<pair<T, T>>
    template<typename T> static vector<pair<T, T>> vp(int n) {vector<pair<T, T>> v(n); rep(i, n) _cin >> v[i].first >> v[i].second; return v;}  // vector<pair<T, T>>
    // tuple
    template<typename... Args> static tuple<Args...> t() {
        tuple<Args...> values;
        apply([](auto&... args) { ((_cin >> args), ...); }, values);
        return values;
    }
};

// debug print utility
namespace deb {
    #include <cxxabi.h>
    // demangle type name
    string demangle(const char* name) {
        int status = -4;
        unique_ptr<char, void(*)(void*)> res{
            abi::__cxa_demangle(name, NULL, NULL, &status),
            free
        };
        return (status == 0) ? string(res.get()) : name ;
    }
    // meta functions for type traits
    template<typename T>
    constexpr bool isArithmeticContainer() { return is_arithmetic<typename T::value_type>::value; }
    // for SFINAE
    template<typename T, typename = void> struct has_key_and_mapped_type : false_type {};
    template<typename T> struct has_key_and_mapped_type<T, void_t<typename T::key_type, typename T::mapped_type>> : true_type {};
    // for map or unordered_map
    template<typename T>
    constexpr bool isMapLike() { return has_key_and_mapped_type<T>::value; }

    // for values
    template<typename T, typename enable_if<is_arithmetic<T>::value, nullptr_t>::type = nullptr>
    void p(const T& x) { cout << x << " "; }
    // for pairs
    template <typename T, typename S>
    void p(const pair<T, S>& _p){ p(_p.first); p(_p.second); cout << endl; }
    // for string
    void p(const string& s) { cout << s << endl; }
    // for containers
    template<typename T,  typename enable_if<!is_arithmetic<T>::value, nullptr_t>::type = nullptr>
    void p(const T& container) {
        // map and unordered_map
        if constexpr (isMapLike<T>()) {
            cout << demangle(typeid(T).name()) << ":" << endl;
            for (const auto& kv : container) {
                cout << "[" << kv.first << "] => ";
                p(kv.second);
                if constexpr (is_arithmetic_v<typename T::mapped_type>) cout << endl;
            }
        // vector or set or others
        } else {
            if constexpr (!isArithmeticContainer<T>()) cout << demangle(typeid(T).name()) << ":" << endl;
            for (auto it = begin(container); it != end(container); ++it) {
                p(*it);
            }
            if constexpr (isArithmeticContainer<T>()) cout << endl;
        }
    }
};  // namespace deb

int main() {
    auto& cin = _cin;
    // speed up io
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    // code
    string s1 = rd::i<string>();
    string s2 = rd::i<string>();

    vector<char> v1(all(s1)), v2(all(s2));
    auto dp = ugilib::edit_distance(v1, v2);
    cout << dp.back().back() << endl;

    // deb::p(dp);

    return 0;
}