Submission #673616

#	Time	Username	Problem	Language	Result	Execution time	Memory
673616		abysmal	Copy and Paste 3 (JOI22_copypaste3)	C++14	1 / 100	375 ms	49104 KiB

copypaste3

#include<iostream>
#include<stdio.h>
#include<stdint.h>
#include<vector>
#include<algorithm>
#include<utility>
#include<set>
#include<map>
#include<queue>
#include<stack>

using namespace std;

const int64_t INF = 1e18 + 777;
const int64_t mINF = 2500 + 1;
const int64_t MOD = 1e9 + 9;
const int nbit = 11;
const int ndig = 10;
const int nchar = 26;
const int p = 31;
const int D = 4;
int dr[D] = {0, 1, 0, -1};
int dc[D] = {1, 0, -1, 0};

struct Solution
{
    int n;
    string s;
    int64_t a;
    int64_t b;
    int64_t c;
    vector<int> pow;
    vector<int> inv;
    vector<int> prefix;
    vector<vector<int> > nx;
    Solution() {}

    void solve()
    {
        pow.resize(mINF, 1);
        inv.resize(mINF, 1);

        for(int i = 2; i < mINF; i++)
        {
            pow[i] = modmul(pow[i - 1], p);
        }

        inv[mINF - 1] = CalcInv(pow[mINF - 1]);
        for(int i = mINF - 1; i > 1; i--)
        {
            inv[i - 1] = modmul(inv[i], p);
        }

        cin >> n >> s >> a >> b >> c;

        prefix.resize(n + 1, 0);
        for(int i = 1; i <= n; i++)
        {
            int ch = s[i - 1] - 'a' + 1;
            ch = modmul(ch, pow[i]);
            ch = modadd(ch, prefix[i - 1]);

            prefix[i] = modadd(prefix[i], ch);
        }

        map<pair<int, int> , vector<int> > mp;
        for(int i = 1; i <= n; i++)
        {
            for(int j = i; j <= n; j++)
            {
                int x = CalcHash(i, j);

                mp[make_pair(x, j - i)].push_back(i - 1);
            }
        }

        nx.resize(n, vector<int>(n, -1));
        for(map<pair<int, int>, vector<int> >::iterator it = mp.begin(); it != mp.end(); it++)
        {
            pair<int, int> pr = (it)->first;
            int len = pr.second;
            Run(len, (it)->second);
        }

        vector<vector<int64_t> > dp(n, vector<int64_t>(n, INF));
        for(int i = 0; i < n; i++)
        {
            dp[i][i] = a;
        }

        for(int len = 0; len < n; len++)
        {
            for(int i = 0; i < n; i++)
            {
                int j = i + len;
                if(len == 0 || j >= n) break;

                dp[i][j] = min(dp[i][j], dp[i][j - 1] + a);
                if(i != n - 1) dp[i][j] = min(dp[i][j], dp[i + 1][j] + a);
            }

            for(int i = 0; i < n; i++)
            {
                int64_t l = i;
                bool f = true;

                while(nx[l][len] != -1)
                {
                    int64_t r = l + len;
                    int64_t nl = nx[l][len];
                    int64_t nr = nl + len;

                    int64_t tmp = dp[i][r] + c + a * (nl - r - 1);
                    if(f) tmp += b + c;
//                    cerr << "i = " << i << " ; r = " << r << " ; nl - r - 1 = " << nl - r - 1 << "\n";
//                    cerr << "dp = " << dp[i][r] << " ; tmp = " << tmp << "\n";
                    dp[i][nr] = min(dp[i][nr], tmp);

                    f = false;
                    l = nl;
                }
            }
        }

//        for(int i = 0; i < n; i++)
//        {
//            for(int j = 0; j < n; j++)
//            {
//                cout << dp[i][j] << " \n"[j == n - 1];
//            }
//        }

        cout << dp[0][n - 1];
    }

    void Run(int len, vector<int>& pos)
    {
        int k = pos.size();
        int l = k - 2;
        int r = k - 1;

        while(l >= 0)
        {
            while(r - 1 >= 0 && pos[r - 1] > pos[l] + len) r--;

            if(pos[r] > pos[l] + len) nx[pos[l]][len] = pos[r];
            l--;
        }
    }

    int CalcHash(int l, int r)
    {
        int ans = modsub(prefix[r], prefix[l - 1]);
        ans = modmul(ans, inv[l]);

        return ans;
    }

    int CalcInv(int t1)
    {
        int res = 1;
        int t2 = MOD - 2;

        while(t2 != 0)
        {
            if(t2 & 1) res = modmul(res, t1);

            t1 = modmul(t1, t1);
            t2 >>= 1;
        }

        return res;
    }

    int modsub(int t1, int t2)
    {
        int res = t1 - t2;
        if(res < 0) res += MOD;

        return res;
    }

    int modadd(int t1, int t2)
    {
        int res = t1 + t2;
        if(res >= MOD) res -= MOD;

        return res;
    }

    int modmul(int t1, int t2)
    {
        int64_t res = 1LL * t1 * t2;
        return (res % MOD);
    }

    bool BIT(int& mask, int& j)
    {
        return (mask & MASK(j));
    }

    int MASK(int j)
    {
        return (1 << j);
    }
};

void __startup()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

//    freopen("in.txt", "r", stdin);
//    freopen("out.txt", "w", stdout);
}

int main()
{
    __startup();
    int t = 1;
//    cin >> t;

    for(int i = 1; i <= t; i++)
    {
        Solution().solve();
    }

    return 0;
}

• Subtask 1: 1 / 1
• Subtask 2: 0 / 5
• Subtask 3: 0 / 14
• Subtask 4: 0 / 10
• Subtask 5: 0 / 32
• Subtask 6: 0 / 38