Submission #244878

#	Time	Username	Problem	Language	Result	Execution time	Memory
244878		NONAME	Rima (COCI17_rima)	C++14	42 / 140	834 ms	36572 KiB

rima

#include <bits/stdc++.h>
#define dbg(x) cerr << #x << " = " << x << "\n"
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie()
using namespace std;
using ll = long long;

const int N = 5e5 + 10;

int n, f[(1 << 20)][20];
string s[N];

bool gd(int x, int y) {
    int l1 = int(s[x].size()), l2 = int(s[y].size()), k = 0;

    if (max(l1, l2) - min(l1, l2) > 1)
        return 0;

    while (k < min(l1, l2) && s[x][k] == s[y][k])
        ++k;

    return (k >= max(l1, l2) - 1);
}

int main() {
    fast_io;

    cin >> n;
    for (int i = 0; i < n; ++i) {
        cin >> s[i];
        reverse(s[i].begin(), s[i].end());
    }

    if (n > 20)
        return void(cout << "0\n"), 0;

    for (int i = 0; i < (1 << n); ++i)
    for (int j = 0; j < n; ++j)
        f[i][j] = 0;

    for (int i = 0; i < n; ++i)
        f[(1 << i)][i] = 1;

    for (int msk = 1; msk < (1 << n); ++msk)
    for (int i = 0; i < n; ++i) {
        if (!(msk & (1 << i)))
            continue;

        for (int j = 0; j < n; ++j)
            if (!(msk & (1 << j)) && gd(i, j))
                f[msk | (1 << j)][j] = max(f[msk | (1 << j)][j], f[msk][i] + 1);
    }

    int ans = 0;

    for (int i = 0; i < (1 << n); ++i)
    for (int j = 0; j < n; ++j)
        ans = max(ans, f[i][j]);

    cout << ans << "\n";
}

• Subtask 1: 42 / 140