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Submission #468886

# Submission time Handle Problem Language Result Execution time Memory
468886 2021-08-30T06:33:16 Z amirmohammad_nezami Dabbeh (INOI20_dabbeh) C++14
50 / 100
 2000 ms 25952 KB 
#include <bits/stdc++.h>
using namespace std;

#define F first
#define S second
#define lc 2 * v
#define rc 2 * v + 1
#define mid (s + e) / 2
#define PB push_back
#define ll long long 
#define ld long double
#define _sz(e) (int)e.size()
#define pii pair <int , int>
#define _all(e) e.begin() , e.end()
#define FAST ios::sync_with_stdio(0); cin.tie(0);

const ll maxn = 3e5 + 4 , N = 1e4 + 4 , base = 307 , mod = 1e9 + 7 , INF = 1e9;

ll pbase[maxn];
int n , m , SZ , res[maxn] , dp[maxn] , pos[maxn] , seg[4 * maxn];
string t[N];
vector <ll> h[N];
vector <pii> q[maxn];

void pre() {
    pbase[0] = 1;
    for (int i = 1; i < maxn; ++i) {
        pbase[i] = (pbase[i - 1] * base) % mod;
    }
    for (int i = 0; i <= n; ++i) {
        h[i].PB(0);
        for (int j = 1; j <= _sz(t[i]); ++j) {
            int val = (h[i].back() * base + t[i][j - 1]) % mod;
            h[i].PB(val);
        }
    }
}

inline int HASH(int i , int l , int r) {
    return (h[i][r] - (h[i][l] * pbase[r - l] % mod) + mod) % mod;
}

inline int LCP(int x , int i) {
    if(t[0][x] != t[i][0]) return 0;
    int l = 1 , r = min(SZ - x , _sz(t[i])) + 1;
    while(l < r - 1) {
        int mm = (l + r) / 2;
        if(HASH(0 , x , x + mm) == HASH(i , 0 , mm)) l = mm;
        else r = mm;
    }
    return l;
}

inline bool check(int x , int i) {
    int lcp = LCP(x , i);
    if(x + lcp == SZ) return (_sz(t[i]) > lcp);
    if(_sz(t[i]) == lcp) return 0;
    return t[0][x + lcp] < t[i][lcp];
}

inline int bs(int x) {
    if(check(x , 1)) return 1;
    int l = 1 , r = n + 1;
    while(l < r - 1) {
        int mm = (l + r) / 2;
        if(check(x , mm)) r = mm;
        else l = mm;
    }
    return r;
}

void add(int p , int x , int v = 1 , int s = 0 , int e = SZ) {
    seg[v] = min(seg[v] , x);
    if(e - s == 1) return ;
    if(p < mid) {
        add(p , x , lc , s , mid); 
        return ;
    }
    add(p , x , rc , mid , e);
}

int get(int l , int r , int v = 1 , int s = 0 , int e = SZ) {
    if(l >= e || s >= r) return INF;
    if(l <= s && e <= r) return seg[v];
    return min(get(l , r , lc , s , mid) , get(l , r , rc , mid , e));
}

int main() {
    FAST;
    cin >> n >> m;
    for (int i = 1; i <= n; ++i) {
        cin >> t[i];
    }
    cin >> t[0];
    sort(t + 1 , t + 1 + n);
    for (int i = 0; i < m; ++i) {
        int l , r; cin >> l >> r; r--;
        q[r].PB({l , i});
    }
    pre();

    SZ = _sz(t[0]);
    for (int i = 0; i < SZ; ++i) {
        pos[i] = bs(i);
        if(_sz(q[i])) {
            fill(seg , seg + 4 * SZ , INF);
            fill(dp , dp + SZ , INF);
            for (int j = i; j >= 0; --j) {
                int mx = 0;
                if(pos[j] <= n) mx = max(mx , LCP(j , pos[j]));
                if(pos[j] > 0) mx = max(mx , LCP(j , pos[j] - 1));
                dp[j] = (mx >= i - j + 1 ? 1 : get(j + 1 , j + mx + 1) + 1);
                add(j , dp[j]);
            }
            for (auto x : q[i]) {
                res[x.S] = dp[x.F];
            }
        }
    }

    for (int i = 0; i < m; ++i) {
        cout << (res[i] >= INF ? -1 : res[i]) << '\n';
    }
}

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 10188 KB Output is correct
2 Correct 95 ms 20092 KB Output is correct
3 Correct 109 ms 18892 KB Output is correct
4 Correct 138 ms 20432 KB Output is correct
5 Correct 141 ms 19824 KB Output is correct
6 Correct 151 ms 21316 KB Output is correct
7 Correct 144 ms 21068 KB Output is correct
8 Correct 150 ms 21688 KB Output is correct
9 Correct 168 ms 20796 KB Output is correct
10 Correct 145 ms 16920 KB Output is correct
11 Correct 125 ms 19724 KB Output is correct
12 Correct 121 ms 17584 KB Output is correct
13 Correct 124 ms 18860 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1269 ms 22204 KB Output is correct
2 Correct 1135 ms 23860 KB Output is correct
3 Correct 1082 ms 22356 KB Output is correct
4 Correct 1085 ms 21152 KB Output is correct
5 Correct 1338 ms 21340 KB Output is correct
6 Correct 412 ms 23872 KB Output is correct
7 Correct 385 ms 24716 KB Output is correct
8 Correct 414 ms 23416 KB Output is correct
9 Correct 503 ms 24184 KB Output is correct
10 Correct 505 ms 24900 KB Output is correct
11 Correct 1284 ms 22504 KB Output is correct
12 Correct 1318 ms 22124 KB Output is correct
13 Correct 1198 ms 25952 KB Output is correct
14 Correct 1221 ms 25044 KB Output is correct
15 Correct 1024 ms 21452 KB Output is correct
16 Correct 1010 ms 24364 KB Output is correct
17 Correct 872 ms 22624 KB Output is correct
18 Correct 924 ms 22596 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 10188 KB Output is correct
2 Correct 95 ms 20092 KB Output is correct
3 Correct 109 ms 18892 KB Output is correct
4 Correct 138 ms 20432 KB Output is correct
5 Correct 141 ms 19824 KB Output is correct
6 Correct 151 ms 21316 KB Output is correct
7 Correct 144 ms 21068 KB Output is correct
8 Correct 150 ms 21688 KB Output is correct
9 Correct 168 ms 20796 KB Output is correct
10 Correct 145 ms 16920 KB Output is correct
11 Correct 125 ms 19724 KB Output is correct
12 Correct 121 ms 17584 KB Output is correct
13 Correct 124 ms 18860 KB Output is correct
14 Correct 1269 ms 22204 KB Output is correct
15 Correct 1135 ms 23860 KB Output is correct
16 Correct 1082 ms 22356 KB Output is correct
17 Correct 1085 ms 21152 KB Output is correct
18 Correct 1338 ms 21340 KB Output is correct
19 Correct 412 ms 23872 KB Output is correct
20 Correct 385 ms 24716 KB Output is correct
21 Correct 414 ms 23416 KB Output is correct
22 Correct 503 ms 24184 KB Output is correct
23 Correct 505 ms 24900 KB Output is correct
24 Correct 1284 ms 22504 KB Output is correct
25 Correct 1318 ms 22124 KB Output is correct
26 Correct 1198 ms 25952 KB Output is correct
27 Correct 1221 ms 25044 KB Output is correct
28 Correct 1024 ms 21452 KB Output is correct
29 Correct 1010 ms 24364 KB Output is correct
30 Correct 872 ms 22624 KB Output is correct
31 Correct 924 ms 22596 KB Output is correct
32 Execution timed out 2075 ms 24360 KB Time limit exceeded
33 Halted 0 ms 0 KB -