Submission #945391

#	Time	Username	Problem	Language	Result	Execution time	Memory
945391		vjudge1	Copy and Paste 3 (JOI22_copypaste3)	C++17	100 / 100	1270 ms	85332 KiB

copypaste3

#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
#include <random>
 
using namespace std;
template<typename T1, typename T2> inline void chkmin(T1 &a, T2 b) {if (a > b) a = b;}
template<typename T1, typename T2> inline void chkmax(T1 &a, T2 b) {if (a < b) a = b;}
#define files(FILENAME) read(FILENAME); write(FILENAME)
#define read(FILENAME) freopen((FILENAME + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((FILENAME + ".out").c_str(), "w", stdout)
#define all(c) (c).begin(), (c).end()
#define sz(c) (int)(c).size()
#define left left228
#define right right228
#define y1 y1228
#define mp make_pair
#define pb push_back
#define y2 y2228
#define rank rank228
using ll = long long;
using ld = long double; 
const string FILENAME = "input";
const int MAXN = 2500 + 7;
const ll inf = 1e18;
const ll Mod = (1LL << 61) - 1;

ll n, a, b, c;
string s;
ll hsh[MAXN][MAXN];
ll dp[MAXN][MAXN];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    //read(FILENAME);
    cin >> n >> s >> a >> b >> c;
    s = "#" + s;
    for (int i = 1; i <= n; i++) {
        for (int j = i; j <= n; j++) {
            hsh[i][j] = (hsh[i][j - 1] * 26 + s[j] - 'a') % Mod;
            dp[i][j] = inf;
        }
        dp[i][i] = a;
    }
    for (int h = 1; h <= n; h++) {
        vector<pair<ll, int>> cand;
        for (int i = 1; i + h - 1 <= n; i++) {
            int j = i + h - 1;
            chkmin(dp[i][j], min(dp[i + 1][j], dp[i][j - 1]) + a);
            cand.pb(mp(hsh[i][j], i));
        }
        sort(all(cand));
        for (auto it: cand) {
            int x = 1;
            int i = it.second;
            while (true) {
                int pos = lower_bound(all(cand), mp(it.first, i + h)) - cand.begin();
                if (pos < sz(cand) && cand[pos].first == it.first) {
                    i = cand[pos].second;
                    x++;
                    chkmin(dp[it.second][i + h - 1], dp[it.second][it.second + h - 1] + b + c * x + a * (i + h - it.second - x * h));
                } else {
                    break;
                }
            }
        }
    }
    cout << dp[1][n] << '\n';
    return 0;
}

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