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Submission #433246

# Submission time Handle Problem Language Result Execution time Memory
433246 2021-06-19T10:54:03 Z parsabahrami Dabbeh (INOI20_dabbeh) C++17
25 / 100
 2000 ms 432972 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,avx,avx2,fma")

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[] = {(int) 1e9 + 9, (int) 1e9 + 7};
struct pair_hash {
    template <class T1, class T2>
    size_t operator () (const std::pair<T1,T2> &p) const {
        auto h1 = std::hash<T1>{}(p.first);
        auto h2 = std::hash<T2>{}(p.second);
        return h1 ^ h2;  
    }
};

int pw[2][N], H[2][N], dp[19][N], rmq[19][19][N], lg[N], n, m, q, base[] = {37, 31}; 
char S[N * 2]; 
unordered_map<pii, int, pair_hash> mp;
pii get_hash(int l, int r) {
    pii h = {(H[0][r] - 1ll * H[0][l - 1] * pw[0][r - l + 1] % MOD[0] + MOD[0]) % MOD[0], 
        (H[1][r] - 1ll * H[1][l - 1] * pw[1][r - l + 1] % MOD[1] + MOD[1]) % MOD[1]};
    return h;
}
     
void build_rmq(int id) {
    for (int i = 1; i <= n; i++) {
        rmq[id][0][i] = dp[id][i];
    }
    for (int i = 1; i < 19; 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) {
    if (r <= l) return l;
    r = min(r, n + 1);
    int x = lg[r - l];
    return max(rmq[id][x][l], rmq[id][x][r - (1 << x)]);
}
     
int main() {
    for (int i = 2; i < N; i++) 
        lg[i] = lg[i >> 1] + 1;
    pw[0][0] = pw[1][0] = 1;
    for (int i = 1; i < N; i++) 
        for (int j : {0, 1})
            pw[j][i] = 1ll * pw[j][i - 1] * base[j] % MOD[j];
    scanf("%d%d", &n, &q);
    for (int i = 1; i <= n; i++) {
        scanf("%s", S);
        pii h = {0, 0};
        for (int j = 0; S[j]; j++) {
            h = {(1ll * h.F * base[0] % MOD[0] + S[j] - 'a' + 1) % MOD[0], 
                (1ll * h.S * base[1] % MOD[1] + S[j] - 'a' + 1) % MOD[1]};
            mp[h] = 1;
        }
    }
    scanf("%s", S + 1); m = strlen(S + 1);
    for (int i = 1; i <= m; i++) {
        for (int j : {0, 1}) 
            H[j][i] = (1ll * H[j][i - 1] * base[j] % MOD[j] + S[i] - 'a' + 1) % MOD[j];
    }
    swap(n, m);
    for (int i = 1; i <= n; i++) {
        int l = i - 1, 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] = l + 1;
    }
    for (int j = 1; j < 19; j++) {
        build_rmq(j - 1);
        for (int i = 1; i <= n; i++) {
            dp[j][i] = get_max(j - 1, i, dp[j - 1][i] + 1);
        }
    }
    for (build_rmq(18); q; q--) {
        int l, r; scanf("%d%d", &l, &r); l++;
        int ret = 0, p = l;
        for (int i = 18; ~i; i--) {
            if (get_max(i, l, p + 1) <= r) ret += 1 << i, p = get_max(i, l, p + 1);
        }
        printf("%d\n", ret > n ? -1 : ret + 1);
    }
    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:60:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:62:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         scanf("%s", S);
      |         ~~~~~^~~~~~~~~
Main.cpp:70:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |     scanf("%s", S + 1); m = strlen(S + 1);
      |     ~~~~~^~~~~~~~~~~~~
Main.cpp:92:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |         int l, r; scanf("%d%d", &l, &r); l++;
      |                   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4428 KB Output is correct
2 Correct 344 ms 28836 KB Output is correct
3 Correct 250 ms 21524 KB Output is correct
4 Correct 413 ms 28924 KB Output is correct
5 Correct 299 ms 24488 KB Output is correct
6 Correct 442 ms 31796 KB Output is correct
7 Correct 422 ms 34272 KB Output is correct
8 Correct 447 ms 33004 KB Output is correct
9 Correct 435 ms 30764 KB Output is correct
10 Correct 193 ms 11968 KB Output is correct
11 Correct 369 ms 32308 KB Output is correct
12 Correct 251 ms 18464 KB Output is correct
13 Correct 301 ms 24588 KB Output is correct

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1759 ms 423488 KB Output is correct
2 Correct 1972 ms 430384 KB Output is correct
3 Correct 1435 ms 425852 KB Output is correct
4 Correct 912 ms 418904 KB Output is correct
5 Correct 899 ms 418472 KB Output is correct
6 Correct 1864 ms 430624 KB Output is correct
7 Execution timed out 2078 ms 432972 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4428 KB Output is correct
2 Correct 344 ms 28836 KB Output is correct
3 Correct 250 ms 21524 KB Output is correct
4 Correct 413 ms 28924 KB Output is correct
5 Correct 299 ms 24488 KB Output is correct
6 Correct 442 ms 31796 KB Output is correct
7 Correct 422 ms 34272 KB Output is correct
8 Correct 447 ms 33004 KB Output is correct
9 Correct 435 ms 30764 KB Output is correct
10 Correct 193 ms 11968 KB Output is correct
11 Correct 369 ms 32308 KB Output is correct
12 Correct 251 ms 18464 KB Output is correct
13 Correct 301 ms 24588 KB Output is correct
14 Correct 1759 ms 423488 KB Output is correct
15 Correct 1972 ms 430384 KB Output is correct
16 Correct 1435 ms 425852 KB Output is correct
17 Correct 912 ms 418904 KB Output is correct
18 Correct 899 ms 418472 KB Output is correct
19 Correct 1864 ms 430624 KB Output is correct
20 Execution timed out 2078 ms 432972 KB Time limit exceeded
21 Halted 0 ms 0 KB -