Submission #421442

#	Time	Username	Problem	Language	Result	Execution time	Memory
421442		Aldas25	Ideal city (IOI12_city)	C++14	23 / 100	43 ms	6944 KiB

city

#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define f first
#define s second
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;

const int MAXN = 100100;
const ll MOD = 1000 * 1000 * 1000;

int x[MAXN], y[MAXN];
ll d[MAXN];
ll n;
vi adj[MAXN];

void bfs (int st) {
    FOR(i, 0, n-1) d[i] = -1;
    queue<int> q;
    q.push(st);
    d[st] = 0;
    while (!q.empty()) {
        int v = q.front();
        q.pop();
        for (int u : adj[v]) {
            if (d[u] == -1) {
                d[u] = d[v]+1;
                q.push(u);
            }
        }
    }
}

ll sub2 () {
    FOR(i, 0, n-1) FOR(j, i+1, n-1) {
        if (abs(x[i] - x[j]) + abs(y[i] - y[j]) == 1){
            adj[i].pb(j);
            adj[j].pb(i);
        }
    }

    ll ans = 0;
    FOR(i, 0, n-1) {
        bfs(i);
        FOR(j, 0, n-1) ans += d[j];
    }
    ans /= 2;

    return ans;
}

map<ll, ll> cntX, cntY;

int DistanceSum(int N, int *X, int *Y) {

    n = N;
    FOR(i, 0, n-1) x[i] = X[i];
    FOR(i, 0, n-1) y[i] = Y[i];



    //ll bruteAns = sub2();

    FOR(i, 0, n-1) cntX[x[i]]++;
    FOR(i, 0, n-1) cntY[y[i]]++;

    ll ans = 0;

    ll cr = 0;

    for (auto p : cntX) {
        cr += p.s;
        ans += cr*(n-cr) % MOD;
        ans %= MOD;
    }

    cr = 0;

    for (auto p : cntY) {
        cr += p.s;
        ans += cr*(n-cr) % MOD;
        ans %= MOD;
    }

    //cout << " brute ans = " << bruteAns << " ans = " << ans << endl;


    return ans%MOD;
}

/*

15
7 5
7 6
8 3
8 4
8 5
8 6
9 3
9 4
9 5
9 6
10 3
10 4
10 5
10 6
11 5

*/

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