Submission #1242774

#	Time	Username	Problem	Language	Result	Execution time	Memory
1242774		domi	Ideal city (IOI12_city)	C++20	0 / 100	4 ms	832 KiB

city

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

const int MOD = 1e9;

int n;
map<int, vector<int>>lin, col;

int solve(map<int, vector<int>>& mp) {

    vector<vector<int>>T;
    map<pair<int, int>, int>id;
    vector<int>s;
    int cnt = 0, idx = 0;

    for (auto &[v, ap] : mp) {
        sort(ap.begin(), ap.end());
        ++idx;

        for (int i = 0; i < ap.size(); ++i) {
            if (i == 0 || ap[i] != ap[i - 1] + 1) {
                ++cnt;
                T.push_back({});
                s.push_back(0);
            }

            id[{v, ap[i]}] = cnt;
            ++s.back();

            if (idx != 1 && id.find({v - 1, ap[i]}) != id.end() && (T[cnt].empty() || id[{v - 1, ap[i]}]) != T[cnt].back()) {
                T[cnt].push_back(id[{v - 1, ap[i]}]);
                T[id[{v - 1, ap[i]}]].push_back(cnt);
            }
        }
    }

    vector<int>SZ(cnt + 1, 0);
    int ans = 0;

    function<void(int, int)> dfs = [&](int nod, int p) {
        SZ[nod] = s[nod] - 1;

        for (int &son : T[nod]) {
            if (son == p) continue;

            dfs(son, nod);
            SZ[nod] += SZ[son];
            ans += (n - SZ[son]) * SZ[son];
        }
    };

    dfs(0, -1);
    return ans;
}

int DistanceSum(int N, int *X, int *Y) {
    n = N;

    for (int i = 0; i < n; ++i) {
        col[X[i]].push_back(Y[i]);
        lin[Y[i]].push_back(X[i]);
    }

    return (solve(lin) + solve(col)) % MOD;
}

// signed main() {
//     cin.tie(nullptr)->sync_with_stdio(false);
//
//     int n;
//     cin >> n;
//
//     vector<int> X(n), Y(n);
//     for (int i = 0; i < n; ++i) {
//         cin >> X[i] >> Y[i];
//     }
//
//     cout << DistanceSum(n, X.data(), Y.data()) << '\n';
//
//     return 0;
// }

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