Submission #1068636

#	Time	Username	Problem	Language	Result	Execution time	Memory
1068636		vjudge1	Text editor (CEOI24_editor)	C++17	14 / 100	559 ms	40576 KiB

Main

#include <bits/stdc++.h>
#define int long long

using namespace std;

void solve() {
    int n, sl, sc, el, ec;
    cin >> n >> sl >> sc >> el >> ec;
    int l[n+1];
    for(int i=1; i<=n; ++i) {
        cin >> l[i];
        ++l[i];
    }
    if(n == 1) {
        cout << 0 << endl;
        return;
    } else if(n == 2) {
        int ans;
        if(el == 2 && sl != 2) {
            ans = sc;
            ans = min(ans, l[1] - sc + 1);
        } else if(el == 2 && sl == 2) {
            cout << 0 << endl;
            return;
        } else if(sl == 2) {
            ans = ec;
            ans = min(ans, 1 + l[1] - ec);
        } else {
            ans = abs(ec - sc);
            ans = min(ans, l[1] - sc + 1 + ec);
        }
        cout << ans << endl;
        return;
    }
    priority_queue<pair<int,pair<int,int>>>pq;
    vector<vector<int>>dp(n+1, vector<int>(5005, INT_MAX));
    vector<vector<bool>>visited(n+1, vector<bool>(5005, 0));
    dp[sl][sc] = 0;
    pq.push({0, {sl, sc}});
    while(!pq.empty()) {
        int x = pq.top().second.first, y = pq.top().second.second;
        if(x == el && y == ec) break;
        pq.pop();
        if(visited[x][y]) continue;
        visited[x][y] = 1;
        if(x != n) { // down
            int new_y = y;
            new_y = min(new_y, l[x+1]);
            if(dp[x+1][new_y] > dp[x][y] + 1) {
                dp[x+1][new_y] = dp[x][y] + 1;
                pq.push({-dp[x+1][new_y], {x+1, new_y}});
            }
        }
        if(x != 1) { // up
            int new_y = y;
            new_y = min(new_y, l[x-1]);
            if(dp[x-1][new_y] > dp[x][y] + 1) {
                dp[x-1][new_y] = dp[x][y] + 1;
                pq.push({-dp[x-1][new_y], {x-1, new_y}});
            }
        }
        if(y == 1 && x != 1) { // left up
            int new_x = x - 1, new_y = l[new_x];
            if(dp[x][y] + 1 < dp[new_x][new_y]) {
                dp[new_x][new_y] = dp[x][y] + 1;
                pq.push({-dp[new_x][new_y], {new_x, new_y}});
            }
        } else if(y != 1) { // left
            if(dp[x][y] + 1 < dp[x][y-1]) {
                dp[x][y-1] = dp[x][y] + 1;
                pq.push({-dp[x][y-1], {x, y-1}});
            }
        }
        if(y == l[x] && x != n) { // right down
            int new_x = x+1, new_y = 1;
            if(dp[x][y] + 1 < dp[new_x][new_y]) {
                dp[new_x][new_y] = dp[x][y] + 1;
                pq.push({-dp[new_x][new_y], {new_x, new_y}});
            }
        } else if(y != l[x]) { // right
            if(dp[x][y] + 1 < dp[x][y+1]) {
                dp[x][y+1] = dp[x][y] + 1;
                pq.push({-dp[x][y+1], {x, y+1}});
            }
        }
    }
    cout << dp[el][ec] << endl;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    int t = 1;
    while(t--) solve();

    return 0;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 5
• Subtask 2: 14 / 14
• Subtask 3: 0 / 26
• Subtask 4: 0 / 11
• Subtask 5: 0 / 44