Submission #433219

#	Time	Username	Problem	Language	Result	Execution time	Memory
433219		parsabahrami	Dabbeh (INOI20_dabbeh)	C++17	0 / 100	2067 ms	19656 KiB

Main

#include <bits/stdc++.h>
 
using namespace std;

typedef long long int ll;
typedef pair<int, int> pii;
 
#define SZ(x)                       (int) x.size()
#define F                           first
#define S                           second
#define lc                          id << 1
#define rc                          lc | 1

const int N = 500 + 10, MOD = 1e9 + 9;
int pw[N], H[N], dp[N], nxt[N], n, m, q, base = 31; unordered_map<int, int> mp;
char S[N * 2];  int seg[N << 2];

int get_hash(int l, int r) {
    return (H[r] - 1ll * H[l - 1] * pw[r - l + 1] % MOD + MOD) % MOD;
}

void upd(int p, int x, int id = 1, int l = 1, int r = n + 2) {
    if (r - l < 2) { seg[id] = x; return; }
    int md = (l + r) >> 1;
    p < md ? upd(p, x, lc, l, md) : upd(p, x, rc, md, r);
    seg[id] = min(seg[lc], seg[rc]);
}

int get(int ql, int qr, int id = 1, int l = 1, int r = n + 2) {
    if (qr <= l || r <= ql) return MOD;
    if (ql <= l && r <= qr) return seg[id];
    int md = (l + r) >> 1;
    return min(get(ql, qr, lc, l, md), get(ql, qr, rc, md, r));
}

int main() {
    pw[0] = 1;
    for (int i = 1; i < N; i++) 
        pw[i] = 1ll * pw[i - 1] * base % MOD;
    scanf("%d%d", &n, &q);
    for (int i = 1; i <= n; i++) {
        scanf("%s", S);
        int h = 0;
        for (int j = 0; S[j]; j++) {
            h = (1ll * h * base % MOD + S[j] - 'a' + 1) % MOD;
            mp[h] = 1;
        }
    }
    scanf("%s", S + 1); m = strlen(S + 1);
    for (int i = 1; i <= m; i++) {
        H[i] = (1ll * H[i - 1] * base % MOD + S[i] - 'a' + 1) % MOD;
    }
    swap(n, m);
    for (int i = 1; i <= n; i++) {
        int l = i, r = n + 1;
        while (r - l > 1) {
            int md = (l + r) >> 1;
            if (mp.count(get_hash(i, md))) l = md;
            else r = md;
        }
        nxt[i] = (mp.count(get_hash(i, i)) ? l : -MOD);
    }
    for (; q; q--) {
        int l, r; scanf("%d%d", &l, &r); l++;
        memset(dp, 0, sizeof dp); fill(seg, seg + N * 4, MOD);
        upd(r + 1, 0);
        for (int i = r; i >= l; i--) {
            if (nxt[i] < 0) dp[i] = MOD;
            else dp[i] = get(i + 1, nxt[i] + 2) + 1;
            upd(i, dp[i]);
        }
        printf("%d\n", dp[l] > n ? -1 : dp[l]);
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         scanf("%s", S);
      |         ~~~~~^~~~~~~~~
Main.cpp:49:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |     scanf("%s", S + 1); m = strlen(S + 1);
      |     ~~~~~^~~~~~~~~~~~~
Main.cpp:64:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         int l, r; scanf("%d%d", &l, &r); l++;
      |                   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 50