Submission #433224

#	Time	Username	Problem	Language	Result	Execution time	Memory
433224		parsabahrami	Dabbeh (INOI20_dabbeh)	C++17	0 / 100	968 ms	440428 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

const int N = 3e5 + 10, MOD = 1e9 + 9;
int pw[N], H[N], dp[20][N], rmq[20][20][N], lg[N], n, m, q, base = 37; unordered_map<int, int> mp;
char S[N * 2]; 

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

void build_rmq(int id) {
    for (int i = 1; i <= n; i++) {
        rmq[id][0][i] = dp[id][i];
    }
    for (int i = 1; i < 20; i++) {
        for (int j = 1; j <= n; j++) {
            if (j + (1 << i) <= n + 1) {
                rmq[id][i][j] = max(rmq[id][i - 1][j], rmq[id][i - 1][j + (1 << (i - 1))]);
            }
        }
    }
}

int get_max(int id, int l, int r) {
    assert(l < r);
    int x = lg[r - l];
    return max(rmq[id][x][l], rmq[id][x][r - (1 << x)]);
}

int get_pos(int l, int x) {
    if (dp[0][l] < 0) return -1;
    int p = -1;
    for (; x; x -= x & -x) {
        int b = __builtin_ctz(x);
        if (!~p) p = dp[b][l];
        else p = get_max(b, l, min(p + 2, n + 1));
        if (p < 0) return -1;
    }
    return p;
}

int main() {
    for (int i = 2; i < N; i++) 
        lg[i] = lg[i >> 1] + 1;
    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;
        }
        dp[0][i] = (mp.count(get_hash(i, i)) ? l : -MOD);
    }
    for (int j = 1; j < 20; j++) {
        build_rmq(j - 1);
        for (int i = 1; i <= n; i++) {
            int p = dp[j - 1][i];
            if (p > 0) dp[j][i] = get_max(j - 1, i, min(n + 1, p + 2));
            else dp[j][i] = -MOD;
        }
    }
    for (build_rmq(19); q; q--) {
        int l, r; scanf("%d%d", &l, &r); l++;
        int ret = 0, p = l - 1;
        for (int i = 19; ~i; i--) {
            if (get_max(i, l, min(p + 2, n + 1)) < r) ret += 1 << i, p = get_max(i, l, min(p + 2, n + 1));
            if (p < 0) break;
        }
        printf("%d\n", p < 0  || ret > n ? -1 : ret + 1);
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:57:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:59:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         scanf("%s", S);
      |         ~~~~~^~~~~~~~~
Main.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     scanf("%s", S + 1); m = strlen(S + 1);
      |     ~~~~~^~~~~~~~~~~~~
Main.cpp:89:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         int l, r; scanf("%d%d", &l, &r); l++;
      |                   ~~~~~^~~~~~~~~~~~~~~~

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