Submission #39118

#	Time	Username	Problem	Language	Result	Execution time	Memory
39118		14kg	Ideal city (IOI12_city)	C++11	100 / 100	956 ms	64948 KiB

city

#include <map>
#include <algorithm>
#include <vector>
#include <stdio.h>
#define N 100000
#define MOD 1000000000
#define INF 2147483646
#define min2(x,y) (x<y?x:y)
#define max2(x,y) (x>y?x:y)

using namespace std;
int n, tree1_len, tree2_len, tree1_cnt[N], tree2_cnt[N];
long long out;
pair<int, long long> t_save[N];
vector<int> tree1[N], tree2[N];
map<int, int > tree1_NUM[N], tree2_NUM[N];
map<int, bool> M[N], tree1_link[N], tree2_link[N];

pair<int, long long> count_tree1(int lev, int up) {
	long long cnt = 0, t = 0;
	pair<int, long long> temp;

	for (auto i : tree1[lev])
		if (i != up) {
			t_save[i] = temp = count_tree1(i, lev);
			t += temp.second, cnt += temp.first;
		}
	for (auto i : tree1[lev])
		if (i != up)
			out += (long long)t_save[i].first*(t - t_save[i].second), out %= MOD;

	out += (long long)tree1_cnt[lev] * t, out %= MOD;
	cnt += (long long)tree1_cnt[lev];
	return{ (int)cnt,t + cnt };
}
pair<int, long long> count_tree2(int lev, int up) {
	long long cnt = 0, t = 0;
	pair<int, long long> temp;

	for (auto i : tree2[lev])
		if (i != up) {
			t_save[i] = temp = count_tree2(i, lev);
			t += temp.second, cnt += temp.first;
		}
	for (auto i : tree2[lev])
		if (i != up) out += (long long)t_save[i].first*(t - t_save[i].second), out %= MOD;


	out += (long long)tree2_cnt[lev] * t, out %= MOD;
	cnt += (long long)tree2_cnt[lev];
	return{ (int)cnt,t + cnt };
}
int DistanceSum(int _n, int *X, int *Y) {
	n = _n;

	int x_min = INF, y_min = INF;
	for (int i = 0; i < n; i++) x_min = min2(x_min, X[i]), y_min = min2(y_min, Y[i]);
	for (int i = 0; i < n; i++) M[X[i] - x_min][Y[i] - y_min] = true;

	for (int i = 0; i < n; i++) {
		int tx = X[i] - x_min, ty = Y[i] - y_min;
		int ttx = tx, tty = ty;

		if (!M[tx][ty - 1]) {
			tree1_len++;
			while (M[tx][ty]) {
				tree1_cnt[tree1_len]++;
				tree1_NUM[tx][ty] = tree1_len;
				ty++;
			}
		} tx = ttx, ty = tty;
		if (!M[tx - 1][ty]) {
			tree2_len++;
			while (M[tx][ty]) {
				tree2_cnt[tree2_len]++;
				tree2_NUM[tx][ty] = tree2_len;
				tx++;
			}
		}
	}

	int x, y;
	for (int i = 0; i < n; i++) {
		int tx = X[i] - x_min, ty = Y[i] - y_min;

		x = tree1_NUM[tx][ty], y = tree1_NUM[tx + 1][ty];
		if (x && y && tree1_link[x][y] == false) {
			tree1_link[x][y] = true, tree1_link[y][x] = true;
			tree1[x].push_back(y), tree1[y].push_back(x);
		}

		x = tree2_NUM[tx][ty], y = tree2_NUM[tx][ty + 1];
		if (x && y && tree2_link[x][y] == false) {
			tree2_link[x][y] = true, tree2_link[y][x] = true;
			tree2[x].push_back(y), tree2[y].push_back(x);
		}
	}
	count_tree1(1, 0), count_tree2(1, 0);
	return (int)out;
}

• Subtask 1: 11 / 11
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 45 / 45