Submission #156021

#	Time	Username	Problem	Language	Result	Execution time	Memory
156021		Minnakhmetov	OBELISK (NOI14_obelisk)	C++14	25 / 25	354 ms	17816 KiB

obelisk

#include <bits/stdc++.h>
   
#define ll long long
#define all(aaa) aaa.begin(), aaa.end()
 
using namespace std;
 
struct E {
    int to, w;
};
 
const int K = 505, H = 105, N = K * H, INF = 1e9;
vector<pair<int, int>> holes[K];
vector<E> g2[N];
int s[K], d2[N], dx[3] = {-1, 1, 0};
int m, k, sx, sy, ex, ey;

int calc(int x, int y) {
    if (m == 1)
        return abs(x) + abs(y);
    int ans = INF;
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            for (int g = 0; g < 2; g++) {
                for (int h = 0; h < 2; h++) {
                    int p = abs(x + dx[i] * (m + 1)),
                        q = abs(y + dx[j] * (m + 1)),
                        t1 = p / (m + 1) + (i < 2),
                        t2 = q / (m + 1) + (j < 2),
                        cur = t1 * 2 + t2 * 2 + g * 2 + h * 2;

                    p %= (m + 1);
                    q %= (m + 1);

                    if (p) {
                        if (!t2)
                            cur += 2;
                        if (g)
                            cur += m + 1 - p;
                        else
                            cur += p;
                    }

                    if (q) {
                        if (!t1)
                            cur += 2;
                        if (h)
                            cur += m + 1 - q;
                        else
                            cur += q;
                    }

                    ans = min(ans, cur);
                }
            }
        }
    }

    return ans;
}
 
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> k >> m >> sx >> sy >> ex >> ey;

    holes[k].push_back({sx, sy});
    holes[0].push_back({ex, ey});

    for (int i = k - 1; i > 0; i--) {
        int h;
        cin >> h;

        while (h--) {
            int x, y;
            cin >> x >> y;
            holes[i].push_back({x, y});
        }
    }

    for (int i = 0; i < k; i++) {
        s[i + 1] = s[i] + holes[i].size();
    }

    for (int i = 1; i <= k; i++) {
        for (int x = 0; x < holes[i].size(); x++) {
            for (int y = 0; y < holes[i - 1].size(); y++) {
                int dist = calc(holes[i - 1][y].first - holes[i][x].first,
                                   holes[i - 1][y].second - holes[i][x].second);
                g2[x + s[i]].push_back({y + s[i - 1], dist});
            }
        }
    }

    priority_queue<pair<int, int>, 
               vector<pair<int, int>>, 
               greater<pair<int, int>>> pq;
                   
    fill(d2, d2 + N, INF);
    d2[s[k]] = 0;
    pq.push({0, s[k]});
 
    while (!pq.empty()) {
        auto p = pq.top();
        pq.pop();
        if (p.first > d2[p.second])
            continue;
        int node = p.second;
 
        for (E e : g2[node]) {
            if (d2[e.to] > d2[node] + e.w) {
                d2[e.to] = d2[node] + e.w;
                pq.push({d2[e.to], e.to});
            }
        }
    }
 
    cout << d2[0] << "\n";

    return 0;
}

Compilation message (stderr)

obelisk.cpp: In function 'int main()':
obelisk.cpp:87:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int x = 0; x < holes[i].size(); x++) {
                         ~~^~~~~~~~~~~~~~~~~
obelisk.cpp:88:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int y = 0; y < holes[i - 1].size(); y++) {
                             ~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 6 / 6
• Subtask 4: 7 / 7