Submission #198951

#	Time	Username	Problem	Language	Result	Execution time	Memory
198951		Alexa2001	Board (CEOI13_board)	C++17	100 / 100	11 ms	1064 KiB

board

#include <bits/stdc++.h>

using namespace std;

/// 11:09

const int Nmax = 1e5 + 5;

int n, m;
int ans = 0;

char A[Nmax], B[Nmax], aux[Nmax];
int d[Nmax];



void trans(char A[], int &n)
{
    int i, j, s = 0;

    for(i=1; i<=n; ++i)
        if(A[i] == 'L' || A[i] == 'R')
        {
            int nr = 0;
            while(i<=n && (A[i] == 'L' || A[i] == 'R'))
            {
                if(A[i] == 'L') ++nr;
                    else --nr;
                ++i;
            }
            --i;

            for(j=1; j<=nr; ++j) aux[++s] = 'L';
            for(j=1; j<=-nr; ++j) aux[++s] = 'R';
        }
        else aux[++s] = A[i];

    n = s;
    for(i=1; i<=n; ++i) A[i] = aux[i];
    s = 0;

    int last = 0;
    d[0] = -1;

    for(i=1; i<=n; ++i)
        if(A[i] == 'U')
        {
            if(d[s] == s-1) last ^= 1;
            --s;
        }
        else if(A[i] == '1')
        {
            ++s;
            if(last == 0) d[s] = d[s-1];
                else d[s] = s-1;
            last = 0;
        }
        else if(A[i] == '2')
        {
            ++s;
            if(last == 1) d[s] = d[s-1];
                else d[s] = s-1;
            last = 1;
        }
        else if(A[i] == 'L')
        {
            if(last == 1)
            {
                last = 0;
                if(d[s] == s-1) d[s] = d[s-1];
                    else d[s] = s-1;
            }
            else
            {
                last = 1;
                int node = d[s];
                if(d[node] == node-1) d[node] = d[node-1];
                    else d[node] = node - 1;
            }
        }
        else if(A[i] == 'R')
        {
            if(last == 0)
            {
                last = 1;
                if(d[s] == s-1) d[s] = d[s-1];
                    else d[s] = s-1;
            }
            else
            {
                last = 0;
                int node = d[s];
                if(d[node] == node-1) d[node] = d[node-1];
                    else d[node] = node - 1;
            }
        }

    n = s;
    for(i=1; i<=n; ++i)
    {
        if(d[i] == -1) A[i] = 0;
            else A[i] = A[d[i]] ^ 1;
    }
}

void read()
{
    cin >> (A+1) >> (B+1);
    n = strlen(A+1);
    m = strlen(B+1);

    trans(A, n);
    trans(B, m);

    if(n > m) ans += n - m, n = m;
        else ans += m - n, m = n;

    int i, p = 0;
    while(A[p+1] == B[p+1] && p < n) ++p;

    for(i=1; i<=n-p; ++i)
        A[i] = A[i+p], B[i] = B[i+p];
    n -= p;
}

int solve()
{
    if(n == 0) return 0;

    int i;
    if(A[1] > B[1])
        for(i=1; i<=n; ++i) swap(A[i], B[i]);

    for(i=2; i<=n; ++i) A[i] ^= 1;
    B[1] = 0;

    int x = 0, y = 0;
    int ans = 2 * n;

    for(i=0; i<=n; ++i)
    {
        ans = min(ans, x + y + 2 * (n-i) + 1);

        x = 2 * x + A[i+1];
        y = 2 * y + B[i+1];

        if(x + y > ans) break;
    }

    return ans;
}

int main()
{
  //  freopen("input", "r", stdin);
    cin.sync_with_stdio(false); cin.tie(0);

    read();
    ans += solve();

    cout << ans << '\n';

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10