제출 #1195073

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1195073		benjaminkleyn	Ideal city (IOI12_city)	C++17	0 / 100	1094 ms	327680 KiB

city

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int n;
vector<int> g[100000];
int weight[100000];

ll result = 0;

ll dfs(int u, int p = -1)
{
    ll sz = weight[u];
    for (int v : g[u])
        if (v != p)
            sz += dfs(v, u);
    result = (result + sz * (n - sz)) % 1000000000;
    return sz;
}

vector<pair<int, int>> cells;
void solve(int N, int *X, int *Y)
{
    n = N;
    cells.resize(0);
    for (int i = 0; i < N; i++)
        cells.push_back({X[i], Y[i]});
    sort(cells.begin(), cells.end());

    int num_blocks = 0;
    map<pair<int, int>, int> block;
    for (int i = 0, j; i < N; i = j + 1) {

        block[cells[i]] = num_blocks;

        j = i;
        while (j+1 < N && cells[j+1].first == cells[i].first && cells[j+1].second == cells[j].second + 1) {
            block[cells[++j]] = num_blocks;
        }

        weight[num_blocks] = j - i + 1;

        num_blocks++;
    }

    set<pair<int, int>> edges;

    for (int i = 0; i < N; i++) {
        pair<int, int> other_cell = {cells[i].first - 1, cells[i].second};
        if (block.find(other_cell) != block.end()) {
            edges.insert(make_pair(block[cells[i]], block[other_cell]));
        }
    }

    for (auto &[u, v] : edges) {
        g[u].push_back(v);
        g[v].push_back(u);
    }

    dfs(0);
}

int DistanceSum(int N, int *X, int *Y)
{
    result = 0;
    solve(N, X, Y);
    solve(N, Y, X);
    return result;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 21
• Subtask 3: 0 / 23
• Subtask 4: 0 / 45