Submission #1048021

#	Time	Username	Problem	Language	Result	Execution time	Memory
1048021		dilanyan	Text editor (CEOI24_editor)	C++17	0 / 100	7 ms	47964 KiB

Main

//-------------dilanyan------------\\ 
 
#define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
#include<stdio.h>
using namespace std;
 
//------------------Kargpefines--------------------\\ 
 
#define ll long long
#define pb push_back
#define all(u) (u).begin(), (u).end()
#define pqueue priority_queue
#define upper upper_bound
#define lower lower_bound
#define umap unordered_map
#define uset unordered_set
 
void KarginSet(string name = "") {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    if (name.size()) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}
 
//-------------------KarginConstants------------------\\ 
 
const ll mod = 1e9 + 7;
const ll inf = 2e9;
 
//-------------------KarginCode-----------------------\\ 
 
const int N = 2000005, M = 1000005;

ll l[N];

vector<pair<int, ll>> g[N];

void KarginSolve() {
    int n, sl, sc, el, ec;
    cin >> n >> sl >> sc >> el >> ec;
    sc--, ec--;
    for (int i = 1;i <= n;i++) cin >> l[i];
    if (ec == 0) {
        cout << sc + abs(sl - el);
        return;
    }
    for (int i = 2;i <= n;i++) {
        g[i].pb({ i - 1,1 }), g[i - 1].pb({ i,1 });
    }
    stack<int> st;
    for (int i = 1; i <= n;i++) {
        while (!st.empty() && l[st.top()] > l[i]) st.pop();
        if (!st.empty()) {
            g[n + i].pb({ n + st.top(),i - st.top() });
        }
        st.push(i);
    }
    while (!st.empty()) st.pop();
    for (int i = n;i >= 1;i--) {
        while (!st.empty() && l[st.top()] > l[i]) st.pop();
        if (!st.empty()) {
            g[n + i].pb({ n + st.top(),st.top() - i });
        }
        st.push(i);
    }
    for (int i = 1;i < n;i++) {
        g[i + 1].pb({ n + i,1 });
        g[n + i].pb({ i + 1,1 });
    }
    pqueue<pair<ll, int>> pq;
    vector<ll> d(2 * n + 1, inf);
    vector<bool> vis(2 * n + 1, false);
    pq.push({ -sc,sl });
    d[sl] = sc;
    for (int i = sl;i <= n;i++) {
        if (l[i] < sc) {
            d[n + i] = i - sl;
            pq.push({ -d[n + i],n + i });
            break;
        }
        pq.push({ -(l[i] - sc + i - sl), n + i});
        d[n + i] = l[i] - sc + i - sl;
    }
    for (int i = sl - 1;i >= 1;i--) {
        if (l[i] < sc) { 
            d[n + i] = sl - i;
            pq.push({ -d[n + i],n + i });
            break;
        }
        pq.push({ -(l[i] - sc + sl - i), n + i });
        d[n + i] = l[i] - sc + sl - i;
    }
    while (!pq.empty()) {
        int u = pq.top().second; pq.pop();
        if (vis[u]) continue;
        vis[u] = true;
        for (auto it : g[u]) {
            int v = it.first, w = it.second;
            if (d[v] > d[u] + w) {
                d[v] = d[u] + w;
                pq.push({ -d[v], v });
            }
        }
    }
    ll ans = inf;
    for (int i = 1;i <= n;i++) {
        ans = min(ans, d[i] + ec + abs(i - el));
    }
    ll mn = ec;
    for (int i = el - 1;i >= 1;i--) {
        mn = min(mn, l[i]);
        if (mn == l[i]) {
            ans = min(ans, el - i + d[n + i] + min(ec - l[i],l[i] + l[el] - ec + 2));
        }
    }
    mn = ec;
    for (int i = el + 1;i <= n;i++) {
        mn = min(mn, l[i]);
        if (mn == l[i]) {
            ans = min(ans, i - el + d[n + i] + min(ec - l[i], l[i] + l[el] - ec));
        }
    }
    cout << ans << '\n';
}

int main() {
    KarginSet();
    int test = 1;
    //cin >> test;
    while (test--) {
        KarginSolve();
    }
    return 0;
}

Compilation message (stderr)

Main.cpp:1:1: warning: multi-line comment [-Wcomment]
    1 | //-------------dilanyan------------\\
      | ^
Main.cpp:8:1: warning: multi-line comment [-Wcomment]
    8 | //------------------Kargpefines--------------------\\
      | ^
Main.cpp:27:1: warning: multi-line comment [-Wcomment]
   27 | //-------------------KarginConstants------------------\\
      | ^
Main.cpp:32:1: warning: multi-line comment [-Wcomment]
   32 | //-------------------KarginCode-----------------------\\
      | ^
Main.cpp: In function 'void KarginSet(std::string)':
Main.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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