oj.uz

Submission #1030409

# Submission time Handle Problem Language Result Execution time Memory
1030409 2024-07-22T04:53:00 Z caterpillow Savez (COCI15_savez) C++17
108 / 120
 90 ms 65536 KB 
#include <bits/stdc++.h>

using namespace std;

using db = long double;
using ll = long long;
using pl = pair<ll, ll>;
using pi = pair<int, int>;
#define vt vector
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(), x.end() 
#define size(x) ((int) (x).size())
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define ROF(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define F0R(i, b) FOR (i, 0, b)
#define endl '\n'
const ll INF = 1e18;
const int inf = 1e9;

/*

if a < b and b < c, then a < c
use string hashing

*/

const int m = 27;
const ll mod = 1e9 + 7;
const ll mx = 2e6 + 1;

ll powm(ll y) {
    ll x = m;
    ll res = 1;
    while (y) {
        if (y & 1) res = (res * x) % mod;
        y >>= 1; 
        x = (x * x) % mod;
    }
    return res;
}

int n;
vt<vt<int>> adj;
vt<int> dp;
unordered_map<int, int> seen;

void push_back(pl& hash, int c) {
    hash = {(hash.f * m + c + 1) % mod, hash.s + 1};
}

void push_front(pl& hash, int c) {
    hash = {(powm(hash.s) * (c + 1) + hash.f) % mod, hash.s + 1};
}

const pl hid = {0, 0};

int dfs(int u) {
    if (dp[u] != -1) return dp[u];
    int res = 0;
    for (int v : adj[u]) {
        res = max(res, dfs(v));
    }
    return dp[u] = res + 1;
}

main() {
    cin.tie(0)->sync_with_stdio(0);

    cin >> n;
    adj.resize(n);
    dp.resize(n, -1);
    seen.reserve(n);
    F0R (i, n) {
        pl lhs = hid, rhs = hid;
        string st; cin >> st;
        F0R (j, size(st)) {
            push_back(lhs, st[j] - 'A');
            push_front(rhs, st[size(st) - j - 1] - 'A');
            if (lhs.f == rhs.f) {
                auto it = seen.find(lhs.f);
                if (it != seen.end()) {
                    adj[it->s].pb(i);
                }
            }
        }
        seen[lhs.f] = i;
    }
    F0R (i, n) dfs(i);
    cout << *max_element(all(dp)) << endl;
}

Compilation message

savez.cpp:68:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   68 | main() {
      | ^~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 3 ms 348 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 500 KB Output is correct
2 Correct 37 ms 344 KB Output is correct
3 Correct 39 ms 852 KB Output is correct

Subtask #4
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 348 KB Output is correct
2 Correct 42 ms 816 KB Output is correct
3 Correct 45 ms 596 KB Output is correct

Subtask #5
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 2128 KB Output is correct
2 Correct 27 ms 2460 KB Output is correct

Subtask #6
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 3924 KB Output is correct
2 Correct 23 ms 4688 KB Output is correct

Subtask #7
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 5208 KB Output is correct
2 Correct 23 ms 6616 KB Output is correct

Subtask #8
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 6992 KB Output is correct
2 Correct 26 ms 9932 KB Output is correct

Subtask #9
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 22092 KB Output is correct
2 Correct 42 ms 28104 KB Output is correct

Subtask #10
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 56 ms 36692 KB Output is correct
2 Correct 56 ms 46540 KB Output is correct
3 Runtime error 90 ms 65536 KB Execution killed with signal 9
4 Halted 0 ms 0 KB -