Submission #100842

#	Time	Username	Problem	Language	Result	Execution time	Memory
100842		dalgerok	Savez (COCI15_savez)	C++17	0 / 120	172 ms	65528 KiB

savez

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


const int N = 505, M = 2e6 + 5, MOD1 = 1e9 + 1337, MOD2 = 999888777;


int n, p1[M], p2[M], dp[N], a[N], ans;
vector < int > h1[N], h2[N];
bool used[N];
vector < int > g[N];
string s[N];
map < pair < int, int >, int > ss;
map < pair < int, int >, vector < int > > q;

inline pair < int, int > get(int i, int l, int r){
    return make_pair(
        (h1[i][r] - h1[i][l - 1] + MOD1) % MOD1 * p1[M - r] % MOD1,
        (h2[i][r] - h2[i][l - 1] + MOD2) % MOD2 * p2[M - r] % MOD2
    );
}

void dfs(int v){
    used[v] = true;
    for(int to : g[v]){
        if(!used[to]){
            dfs(to);
        }
        dp[v] = max(dp[v], dp[to]);
    }
    dp[v] += a[v];
    ans = max(ans, dp[v]);
}

main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    p1[0] = p2[0] = 1;
    for(int i = 1; i < M; i++){
        p1[i] = p1[i - 1] * 59 % MOD1;
        p2[i] = p2[i - 1] * 45 % MOD2;
    }
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> s[i];
        int sz = (int)s[i].size();
        h1[i].resize(sz + 2);
        h2[i].resize(sz + 2);
        for(int j = 1; j <= sz; j++){
            h1[i][j] = (h1[i][j - 1] + 1LL * s[i][j - 1] * p1[j]) % MOD1;
            h2[i][j] = (h2[i][j - 1] + 1LL * s[i][j - 1] * p2[j]) % MOD2;
        }
        int hh1 = h1[i][sz] * p1[M - sz] % MOD1,
            hh2 = h2[i][sz] * p2[M - sz] % MOD2;
        ///cout << hh1 << " " << hh2 << "\n";
        if(ss[make_pair(hh1, hh2)]){
            a[ss[make_pair(hh1, hh2)]] += 1;
        }
        else{
            ss[make_pair(hh1, hh2)] = i;
            a[i] += 1;
            q[make_pair(hh1, hh2)].push_back(i);
        }
    }
    for(int i = 1; i <= n; i++){
        int sz = (int)s[i].size();
        for(int j = 1; j <= sz; j++){
            auto it1 = get(i, 1, j),
                 it2 = get(i, sz - j + 1, sz);
            if(it1 == it2){
                ///cout << i << " " << j << " " << it1.first << " " << it1.second << "\n";
                for(auto it3 : q[it1]){
                    if(it3 != i){
                        g[it3].push_back(i);
                    }
                }
            }
        }
    }
    for(int i = 1; i <= n; i++){
        if(!used[i]){
            dfs(i);
        }
    }
    cout << ans;
}

Compilation message (stderr)

savez.cpp:36:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

• Subtask 1: 0 / 12
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