Submission #1001736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1001736		vjudge1	Dabbeh (INOI20_dabbeh)	C++17	0 / 100	322 ms	39484 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
#define oo 1e9
const int MAX = 1e4 + 5, MAX2 = 500 + 5, B = 61, MOD = 1e9 + 7;

int n, q;
string s;
string t[MAX];

map<int, int> mp;
int pre[MAX2];
int dp[MAX2][MAX2];
int P[(int)5e5 + 5];
int invP[(int)5e5 + 5];

int binpow(int a, int b){
    if(b == 0) return 1;
    if(b & 1) return binpow(a, b - 1) % MOD * a % MOD;
    return binpow(a * a % MOD, b / 2) % MOD;
}
int inv(int a){
    return binpow(a, MOD - 2);
}

int calc(int l, int r){
    return (pre[r] - pre[l - 1] + 2 * MOD) % MOD * invP[l - 1] % MOD;
}

void solve(){
    P[0] = 1;
    invP[0] = 1;
    for(int i = 1; i <= 5e5; i++){
        P[i] = P[i - 1] * B % MOD;
        invP[i] = invP[i - 1] * inv(B) % MOD;
    }
    cin >> n >> q;
    for(int i = 1; i <= n; i++){
        cin >> t[i];
        int H = 0;
        for(int j = 0; j < t[i].size(); j++){
            H = (H + (t[i][j] - 'a' + 1) * P[j] % MOD) % MOD;
            mp[H] = 1;
        }
        cout << '\n';
    }
    cin >> s;
    int L = s.size();
    for(int i = 1; i <= L; i++){
        pre[i] = (pre[i - 1] + (s[i - 1] - 'a' + 1) * P[i - 1] % MOD) % MOD; 
    }
    for(int sz = 1; sz <= L; sz++){
        for(int i = 1; i + sz - 1 <= L; i++){
            int j = i + sz - 1;
            dp[i][j] = oo;
            if(mp.count(calc(i, j))){
                dp[i][j] = 1;
                continue;
            }
            for(int k = i; k <= j - 1; k++){
                dp[i][j] = min(dp[i][k] + dp[k + 1][j], dp[i][j]);
            }
        }
    }
    while(q--){
        int l, r; cin >> l >> r;
        l++;
        if(dp[l][r] == oo) dp[l][r] = -1;
        cout << dp[l][r] << '\n';
    }
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:45:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         for(int j = 0; j < t[i].size(); j++){
      |                        ~~^~~~~~~~~~~~~

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