Submission #1059661

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059661		vjudge1	Copy and Paste 3 (JOI22_copypaste3)	C++17	25 / 100	3114 ms	710024 KiB

copypaste3

#include <bits/stdc++.h>

using namespace std;
    
typedef long long ll;
#define int ll
const int  N = 2500 + 2;
struct H{
    int p,mod;
    vector<ll> h,inv;
    ll binpow(ll a,ll b) {
        ll ret = 1,k = a;
        while(b) {
            if(b & 1) {
                ret *= k;
                ret %= mod;
            }
            k *= k;
            k%=mod;
            b /= 2;
        }
        return ret;
    }
    void init(string s) {
        int n = (int)s.size();
        h.resize((int)s.size());
        inv.resize((int)s.size());
        ll x = 1;
        for(int i = 0;i < n;i++) {
            h[i] = x * 1ll * (s[i] - 'a' + 1)%mod;
            if(i) h[i] += h[i - 1];
            if(h[i] >= mod) h[i] -= mod;
            inv[i] = binpow(x,mod-2);
            x = x * 1ll * p%mod;
        }
    }
    int get(int l,int r) {
        ll val = h[r];
        if(l) {
            val -= h[l - 1];
        }
        if(val < 0) val += mod;
        val = val * inv[l]%mod;
        return val;
    }

}xx,yy;
string s;
ll a,b,c,h[N],p = 167,inv[N];
map<pair<int,int>,ll> mem;
ll solve(int l,int r) {
    if(r == l) {
        return a;
    }
    pair<int,int> t = {xx.get(l,r),yy.get(l,r)};
    if(mem.count(t)) {
        return mem[t];
    }
    vector<pair<pair<int,int>,array<int,2>>> x;
    int mx = (r - l + 1) / 2;
    for(int i = l;i <= r;i++) {
        for(int j = i;j <= min(r,i+mx-1);j++) {
            pair<int,int> T = {xx.get(i,j),yy.get(i,j)};
            // if(j != r) continue;
            x.push_back({T,{i,j}});
        }
    }
    sort(x.begin(),x.end());
    ll res = min(solve(l,r-1) + a,(r - l + 1) * 1ll * a);
    int n = (r - l + 1);
    for(int i  = 0;i < (int)x.size();) {
        int j = i;
        while(j < (int)x.size() && x[i].first == x[j].first) {
            j++;
        }
        if(x[j - 1].second[1] != r) {
            i = j;
            continue;
        }
        int mn = -1,col = 0;
        for(int k = i;k < j;k++) {
            if(x[k].second[0] > mn) {
                mn = x[k].second[1];
                col++;
            }
        }
        int sz = (x[i].second[1] - x[i].second[0] + 1);
        // cout << l << ' ' << r << ' ' << sz << ' ' << col << '\n';
        if(col == 1) {
            i = j;
            continue;
        }
        assert(sz <= n / 2);
        ll val = solve(x[i].second[0],x[i].second[1]) + (n - sz * 1ll * col) * 1ll * a + (col - 1) * c + b + c;
        res = min(res,val);
        i = j;
    }
    // cout << l << ' ' << r << ' ' << res << '\n';
    return mem[t] = res;
}
int n;
void test() {
    cin >> n >> s >> a >> b >> c;
    yy.p = 37;yy.mod = 998244353;yy.init(s);
    xx.p = 167;xx.mod = (int)1e9 + 7;xx.init(s);
    // cout << xx.get(1,2) << ' ' << yy.get(1,2) << ' ' << xx.get(4,5) << ' ' << yy.get(4,5) << '\n';
    cout << solve(0,n-1);
}
signed main() {
    ios_base::sync_with_stdio(false);cin.tie(0);
    int t = 1; 
    // cin >> t;
    while(t--) {
        test();
    }
}  

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