Submission #873087

#	Time	Username	Problem	Language	Result	Execution time	Memory
873087		RedGrey1993	Round words (IZhO13_rowords)	C++17	24 / 100	64 ms	21972 KiB

rowords

#include <algorithm>
#include <bits/stdc++.h>
#include <chrono>
#include <iomanip>
#include <limits>
#include <string>
#include <thread>

using namespace std;

template <typename T1, typename T2> istream &operator>>(istream &is, const pair<T1, T2> &pa) { is >> pa.first >> pa.second; return is; }
template <typename T> istream &operator>>(istream &is, vector<T> &vec) { for (auto &v : vec) is >> v; return is; }
template <typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa) { os << "(" << pa.first << "," << pa.second << ")"; return os; }
template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) { os << "["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template <typename T> ostream &operator<<(ostream &os, const deque<T> &vec) { os << "deq["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template <typename T> void resize_array(vector<T> &vec, int len) { vec.resize(len); }
template <typename T, typename... Args> void resize_array(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) resize_array(v, args...); }
template <typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }
template <typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }
long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; }
mt19937 mrand(random_device{}());
int rnd(int x) { return mrand() % x; }

template <unsigned int MOD>
class ModInt {
public:
    ModInt(unsigned long long _v = 0) { set_v((_v % MOD + MOD)); }
    explicit operator bool() const { return val != 0; }
    ModInt operator-() const { return ModInt() - *this; }
    ModInt operator+(const ModInt &r) const { return ModInt().set_v(val + r.val); }
    ModInt operator-(const ModInt &r) const { return ModInt().set_v(val + MOD - r.val); }
    ModInt operator*(const ModInt &r) const { return ModInt().set_v((unsigned int)((unsigned long long)(val)*r.val % MOD)); }
    ModInt operator/(const ModInt &r) const { return *this * r.inv(); }
    ModInt &operator+=(const ModInt &r) { return *this = *this + r; }
    ModInt &operator-=(const ModInt &r) { return *this = *this - r; }
    ModInt &operator*=(const ModInt &r) { return *this = *this * r; }
    ModInt &operator/=(const ModInt &r) { return *this = *this / r; }
    // ModInt &operator=(unsigned long long _v) { set_v((_v % MOD + MOD)); return *this; }
    unsigned int operator=(unsigned long long _v) { set_v((_v % MOD + MOD)); return val; }
    bool operator==(const ModInt &r) const { return val == r.val; }
    bool operator!=(const ModInt &r) const { return val != r.val; }
    ModInt pow(long long n) const {
        ModInt x = *this, r = 1;
        while (n) {
            if (n & 1)
                r *= x;
            x *= x;
            n >>= 1;
        }
        return r;
    }
    ModInt inv() const { return pow(MOD - 2); }
    unsigned int get_val() { return val; }
    friend ostream &operator<<(ostream &os, const ModInt &r) { return os << r.val; }
    friend istream &operator>>(istream &is, ModInt &r) { return is >> r.val; }
private:
    unsigned int val;
    ModInt &set_v(unsigned int _v) {
        val = (_v < MOD) ? _v : _v - MOD;
        return *this;
    }
};
constexpr unsigned int mod = 1e9+7;
using Mint = ModInt<mod>;

#define rep(i, a, n) for (int i = a; i < (n); i++)
#define per(i, a, n) for (int i = (n)-1; i >= a; i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define sz(x) ((int)(x).size())
typedef vector<int> vi;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef double db;
#if DEBUG
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl;
#else
#define dbg(x)
#endif

using Mint2 = ModInt<mod-1>;
class Solution {
    struct Node {
        int r,c;
        bool operator<(const Node& node) const {
            if (r == node.r) return c < node.c;
            return r < node.r;
        }
        friend istream &operator>>(istream &is, Node &node) { return is >> node.r >> node.c; }
    };
public:
    void Solve() {
        string s,t;
        while(cin>>s>>t) {
            s += s;
            // dbg(s);
            int n = sz(s), m=sz(t);
 
            auto get_lcs = [&] () {
                vector<vector<pii>> dp(n+1, vector<pii>(m+1));
                rep(i,0,n) {
                    rep(j,0,m) {
                        if (s[i] == t[j]) {
                            dp[i+1][j+1].first = dp[i][j].first + 1;
                            dp[i+1][j+1].second = i+1;
                        }
                        else {
                            dp[i+1][j+1] = dp[i][j+1];
                            if (dp[i+1][j].first > dp[i+1][j+1].first) {
                                dp[i+1][j+1] = dp[i+1][j];
                            } else if (dp[i+1][j].first == dp[i+1][j+1].first
                                      && dp[i+1][j].second > dp[i+1][j+1].second) {
                                dp[i+1][j+1] = dp[i+1][j];
                            }
                        }
                    }
                }
 
                // dbg(dp);
                // dbg(dp[n/2][m]);
 
                int ans = 0;
                rep(last, n/2, n) {
                    int x = last, y = m;
                    int cnt = 0;
                    while(x > last - n/2 && y && dp[x][y].first) {
                        while(y && dp[x][y].second < last - n/2) {
                            y--;
                        }
                        if (y==0) break;
                        if (dp[x][y].second > 0) {
                            x = dp[x][y].second ;
                            cnt++;
                            while(y && dp[x][y].second == dp[x][y-1].second) {
                                y--;
                            }
                            x--;
                        }
                    }
                    // dbg(mp(x,y));
                    // dbg(mp(last, cnt));
                    ans = max(ans, cnt);
                }
                // dbg(ans);
                return ans;
            };
 
            int ans = get_lcs();
            reverse(all(s));
            ans = max(ans, get_lcs());
            cout << ans << endl;
        }
    }
private:
};

// #define USACO 1
void set_io(const string &name = "") {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
#if FILE_IO || USACO
    if (!name.empty()) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
#endif
}

int main() {
#if USACO
    set_io("help");
#else
    set_io("input");
#endif
    Solution().Solve();

    return 0;
}

• Subtask 1: 24 / 100