Submission #207548

#	Time	Username	Problem	Language	Result	Execution time	Memory
207548		MetB	OBELISK (NOI14_obelisk)	C++14	25 / 25	332 ms	94968 KiB

obelisk

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

using namespace __gnu_pbds;

#define N 2000001

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

const ll INF = 1e18, MOD = 1e9 + 7, MOD2 = 1e6 + 3;

int dx[3] = {-1, 1, 0};

struct Pt {
	ll x, y;
} S, E;

int n, m;

vector <Pt> p[N];
vector <ll> d[N];

ll dist (Pt a, Pt b) {
	ll x = abs (a.x - b.x), y = abs (a.y - b.y);
	if(m == 1) return abs (x) + abs (y);
	int ans = 1e9;
	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));
					int q = abs (y + dx[j] * (m + 1));
					int t1 = p / (m + 1) + (i < 2);
					int t2 = q / (m + 1) + (j < 2);
					int 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;
} 

int main () {
	cin >> n >> m;

	cin >> S.x >> S.y >> E.x >> E.y;

	d[0].push_back (0);
	p[0].push_back (S);

	for (int i = 1; i < n; i++) {
		int h;
		cin >> h;
		d[i].resize (h);
		p[i].resize (h);

		for (int j = 0; j < h; j++) {
			cin >> p[i][j].x >> p[i][j].y;
			d[i][j] = INF;

			for (int k = 0; k < p[i-1].size (); k++) {
				d[i][j] = min (d[i][j], d[i-1][k] + dist (p[i-1][k], p[i][j]));
			}
		}
	}

	ll ans = INF;

	for (int i = 0; i < p[n-1].size (); i++) {
		ans = min (ans, d[n-1][i] + dist (p[n-1][i], E));
	}

	cout << (ans == INF ? -1 : ans);
}

Compilation message (stderr)

obelisk.cpp: In function 'int main()':
obelisk.cpp:83:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int k = 0; k < p[i-1].size (); k++) {
                    ~~^~~~~~~~~~~~~~~~
obelisk.cpp:91:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < p[n-1].size (); i++) {
                  ~~^~~~~~~~~~~~~~~~

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