Submission #969056

#	Time	Username	Problem	Language	Result	Execution time	Memory
969056		sano	Walk (CEOI06_walk)	C++14	100 / 100	370 ms	57656 KiB

walk

#include<iostream>
#include<vector>
#include<queue>
#include<string>
#include<fstream>
#include<algorithm>
#include <iomanip>
#include<map>
#include <set>
#include <math.h>
#define ll long long
#define For(i, n) for(ll i = 0; i < (ll)n; i++)
#define ffor(i, a, n) for(ll i = (ll)a; i < (ll)n; i++)
#define rfor(i, n) for(ll i = (ll)n; i >= (ll)0; i--)
#define rffor(i, a, n) for(ll i = (ll)n; i >= (ll)a; i--)
#define vec vector
#define ff first
#define ss second
#define pb push_back
#define pii pair<ll, ll>
#define NEK 1000000000
#define mod (1e9 + 7)
#define rsz resize
#define prv 4
#define D 8
using namespace std;

struct budova {
    vec<ll> x;
    vec<ll> y;
    ll ind;
};

struct udalost {
    ll y, x, ind, typ;
};

bool zorad_udalosti(udalost a, udalost b) {
    if (a.y == b.y) {
        if (a.x == b.x) {
            return a.typ < b.typ;
        }
        return a.x < b.x;
    }
    return a.y < b.y;
}

bool zorad_obdlzniky(budova a, budova b) {
    return a.x[0] < b.x[0];
}

ll dist(pii a, pii b) {
    return abs(a.first - b.first) + abs(a.second - b.second);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    pii finish;
    cin >> finish.ff >> finish.ss;
    ll n;
    cin >> n;
    vec<budova> p;
    vec<budova> p_pov;
    vec<udalost> p2;
    For(i, n) {
        ll x1, y1, x2, y2;
        cin >> x1 >> y1 >> x2 >> y2;
        if (y1 < y2) swap(y1, y2);
        if (x1 > x2) swap(x1, x2);
        p_pov.pb({ { x1, x2 }, { y1, y2 }, i });
        p.push_back({ {x1, x2}, {y1, y2}, i });
        p2.push_back({ y2, x2, i, 0});
        p2.push_back({ y1 + 1, x2, i, 1 });
        p2.push_back({ y2 - 1, x2 + 1, i, 2 });
        p2.push_back({ y1 + 1, x2 + 1, i, 3 });
    }
    p2.push_back({ finish.ss, finish.ff, n, 2 });
    vec<vec<ll>> next(n + 1, vec<ll>(2, 0));
    sort(p2.begin(), p2.end(), zorad_udalosti);
    set<pii> s;
    For(i, p2.size()) {
        if (p2[i].typ == 0) {
            s.insert({ p2[i].x, p2[i].ind });
        }
        if (p2[i].typ == 1) {
            s.erase({ p2[i].x, p2[i].ind });
        }
        if (p2[i].typ == 2) {
            auto q = s.lower_bound({ p2[i].x, p2[i].ind });
            ll dalsi = -1;
            if (q != s.begin()) {
                q--;
                dalsi = q->second;
            }
            next[p2[i].ind][0] = dalsi;
        }
        if (p2[i].typ == 3) {
            auto q = s.lower_bound({ p2[i].x, p2[i].ind });
            ll dalsi = -1;
            if (q != s.begin()) {
                q--;
                dalsi = q->second;
            }
            next[p2[i].ind][1] = dalsi;
        }
    }
    sort(p.begin(), p.end(), zorad_obdlzniky);
    vec<vec<ll>> dp(n, vec<ll>(2, NEK));
    vec<vec<ll>> bt(n + 1, vec<ll>(2, -1));
    pii start = { 0, 0 };
    For(i, n) {
        pii roh = { p[i].x[1] + 1, p[i].y[1] - 1 };
        ll o = next[p[i].ind][0];
        if (o == -1) dp[p[i].ind][0] = dist(start, roh);
        else {
            pii roh_1_z = { p_pov[o].x[1] + 1, p_pov[o].y[1] - 1 };
            pii roh_2_z = { p_pov[o].x[1] + 1, p_pov[o].y[0] + 1 };
            dp[p[i].ind][0] = min(dp[o][0] + dist(roh_1_z, roh), dp[o][1] + dist(roh_2_z, roh));
            if (dp[p[i].ind][0] == (dp[o][1] + dist(roh_2_z, roh))) {
                bt[p[i].ind][0] = 1;
            }
            else {
                bt[p[i].ind][0] = 0;
            }
        }
        roh = { p[i].x[1] + 1, p[i].y[0] + 1 };
        o = next[p[i].ind][1];
        if (o == -1) dp[p[i].ind][1] = dist(start, roh);
        else {
            pii roh_1_z = { p_pov[o].x[1] + 1, p_pov[o].y[1] - 1 };
            pii roh_2_z = { p_pov[o].x[1] + 1, p_pov[o].y[0] + 1 };
            dp[p[i].ind][1] = min((dp[o][0] + dist(roh_1_z, roh)), (dp[o][1] + dist(roh_2_z, roh)));
            if (dp[p[i].ind][1] == (dp[o][1] + dist(roh_2_z, roh))) {
                bt[p[i].ind][1] = 1;
            }
            else {
                bt[p[i].ind][1] = 0;
            }
        }
    }
    ll o = next[n][0];
    if (o == -1) {
        ll odp = dist(start, finish);
        cout << odp << '\n';
        cout << 2 << '\n';
        cout << (finish.ff - start.ff) << ' ' << 0 << ' ' << 0 << ' ' << (finish.ss - start.ss) << '\n';
        return 0;
    }
    pii roh1 = { p_pov[o].x[1] + 1, p_pov[o].y[1] - 1 };
    pii roh2 = { p_pov[o].x[1] + 1, p_pov[o].y[0] + 1 };
    ll d1 = dist(roh1, finish);
    ll d2 = dist(roh2, finish);
    ll odp = min(dp[o][0] + d1, dp[o][1] + d2);
    if (odp == dp[o][1] + d2) {
        bt[n][0] = 1;
    }
    else {
        bt[n][0] = 0;
    }
    pii som = { n, 0 };
    pii koniec2 = { p_pov[o].x[1] + 1, p_pov[o].y[(bt[som.ff][som.ss] + 1) % 2] + bt[som.ff][som.ss] * 2 - 1 };
    pii zaciatok2 = finish;
    vec<pii> vypis;
    if (zaciatok2.ff != koniec2.ff) {
        vypis.push_back({ zaciatok2.ff - koniec2.ff, 0 });
    }
    vypis.push_back({ 0, zaciatok2.ss - koniec2.ss });
    som.ss = bt[som.ff][som.ss];
    som.ff = o;
    while (bt[som.ff][som.ss] != -1) {
        ll n_o = next[som.ff][som.ss];
        ll strana = bt[som.ff][som.ss];
        pii koniec = { p_pov[n_o].x[1] + 1, p_pov[n_o].y[(strana + 1) % 2] + strana * 2 - 1 };
        pii zaciatok = { p_pov[som.ff].x[1] + 1, p_pov[som.ff].y[(som.ss + 1) % 2] + som.ss * 2 - 1 };
        vypis.push_back({ zaciatok.ff - koniec.ff, 0 });
        vypis.push_back({ 0, zaciatok.ss - koniec.ss });
        ll novy_s = strana;
        ll novy_f = n_o;
        som.ff = novy_f;
        som.ss = novy_s;
    }
    pii zaciatok = { p_pov[som.first].x[1] + 1, p_pov[som.first].y[(som.second + 1) % 2] + som.second * 2 - 1 };
    pii koniec = start;
    vypis.push_back({ zaciatok.ff - koniec.ff, 0 });
    vypis.push_back({ 0, zaciatok.ss - koniec.ss });
    cout << odp << '\n';
    cout << vypis.size() << '\n';
    For(i, vypis.size()) {
        cout << vypis[vypis.size() - 1 - i].ff << ' ' << vypis[vypis.size() - 1 - i].ss << '\n';
    }
    return 0;
}

• Subtask 1: 100 / 100