Submission #101086

#	Time	Username	Problem	Language	Result	Execution time	Memory
101086		choikiwon	Round words (IZhO13_rowords)	C++17	100 / 100	391 ms	55160 KiB

rowords

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

typedef pair<int, int> pii;

const int MN = 2010;

int N, M;
string S, T;
int len[MN << 1][MN];
pii par[MN << 1][MN];
int root, ans;

int trace(int r, int c) {
    int ret = 0;
    while(r != root || c) {
        int nr = par[r][c].first;
        int nc = par[r][c].second;
        r = nr;
        c = nc;
        ret++;
    }
    return ret;
}

void reroot() {
    int i = root;
    int j = 1;
    while(j <= M && par[i][j] != pii(i - 1, j - 1)) j++;
    if(j > M) return;
    par[i][j] = pii(i, j - 1);
    while(i < 2 * N && j < M) {
        if(par[i + 1][j] == pii(i, j)) {
            i++;
            par[i][j] = pii(i, j - 1);
        }
        else if(par[i + 1][j + 1] == pii(i, j)) {
            i++;
            j++;
            par[i][j] = pii(i, j - 1);
        }
        else j++;
    }
    while(i < 2 * N && par[i + 1][j] == pii(i, j)) {
        i++;
        par[i][j] = pii(i, j - 1);
    }
}

void solve() {
    for(int i = 0; i <= 2 * N; i++) {
        for(int j = 0; j <= M; j++) {
            if(!i && !j) continue;

            len[i][j] = 1e9;
            if(j && len[i][j] > len[i][j - 1] + 1) len[i][j] = len[i][j - 1] + 1, par[i][j] = pii(i, j - 1);
            if(i && j && S[(i - 1) % N] == T[j - 1] && len[i][j] > len[i - 1][j - 1] + 1) len[i][j] = len[i - 1][j - 1] + 1, par[i][j] = pii(i - 1, j - 1);
            if(i && len[i][j] > len[i - 1][j] + 1) len[i][j] = len[i - 1][j] + 1, par[i][j] = pii(i - 1, j);
        }
    }

    root = 0;
    ans = max(ans, N + M - trace(N, M));
    for(int i = 1; i < N; i++) {
        root++;
        reroot();
        ans = max(ans, N + M - trace(N + i, M));
    }

    //cout << ans << endl;
}

int main() {
    std::ios::sync_with_stdio(false);

    cin >> S >> T;

    N = S.size();
    M = T.size();

    solve();
    reverse(T.begin(), T.end());
    solve();

    cout << ans;
}

• Subtask 1: 100 / 100