Submission #725777

#	Time	Username	Problem	Language	Result	Execution time	Memory
725777		PixelCat	Sky Walking (IOI19_walk)	C++14	0 / 100	168 ms	23544 KiB

walk

#include "walk.h"
#ifdef NYAOWO
#include "grader.cpp"
#endif

#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i <= b; i++)
#define Forr(i,a, b) for(int i = a; i >= b; i--)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define eb emplace_back
#define int LL
using namespace std;
using LL = long long;
using pii = pair<int, int>;
using Vi = vector<int32_t>;

const int MAXN = 100010;
const int INF = 2e9;

int n, m;

Vi st[MAXN], ed[MAXN];
int solve_1n(Vi x, Vi h, Vi l, Vi r, Vi y) {
    For(i, 0, m - 1) {
        st[l[i]].eb(y[i]);
        ed[r[i]].eb(y[i]);
    }
    map<int, int> mp;
    mp[0] = INF; mp[INF] = INF;
    for(auto &i:st[0]) mp[i] = i;
    auto eval = [&](int p, int hei) {
        auto it1 = mp.upper_bound(p);
        auto it2 = prev(it1);
        int res = p - (it2->F) + (it2->S);
        if(it1->F <= hei) {
            res = min(res, (it1->F) - p + (it1->S));
        }
        // cout << (it1->F) << " " << (it1->S) << "\n";
        // cout << (it2->F) << " " << (it2->S) << "\n";
        return res;
    };
    For(i, 1, n - 2) {
        set<int> upd;
        for(auto &j:st[i]) {
            int k = eval(j, h[i]);
            mp[j] = k;
            upd.insert(j);
        }
        for(auto &j:ed[i]) if(!upd.count(j)) {
            mp.erase(j);
        }
    }
    // cout << "\n";
    // for(auto &p:mp) cout << p.F << " " << p.S << "\n";
    // cout << "\n";
    int ans = eval(0, h[n - 1]) + x.back() - x[0];
    if(ans >= INF) return -1;
    return ans;
}

long long min_distance(Vi x, Vi h, Vi l, Vi r, Vi y, int32_t s, int32_t g) {
	n = sz(x);
    m = sz(l);
    return solve_1n(x, h, l, r, y);
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 18
• Subtask 5: 0 / 43