Submission #430522

#	Time	Username	Problem	Language	Result	Execution time	Memory
430522		wiwiho	Ideal city (IOI12_city)	C++14	100 / 100	195 ms	27712 KiB

city

#include <bits/stdc++.h>
#include <bits/extc++.h>

#define StarBurstStream ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define iter(a) a.begin(), a.end()
#define riter(a) a.rbegin(), a.rend()
#define lsort(a) sort(iter(a))
#define gsort(a) sort(riter(a))
#define pb(a) push_back(a)
#define eb(a) emplace_back(a)
#define pf(a) push_front(a)
#define ef(a) emplace_front(a)
#define pob pop_back()
#define pof pop_front()
#define mp(a, b) make_pair(a, b)
#define F first
#define S second
#define mt make_tuple
#define gt(t, i) get<i>(t)
#define tomax(a, b) ((a) = max((a), (b)))
#define tomin(a, b) ((a) = min((a), (b)))
#define topos(a) ((a) = (((a) % MOD + MOD) % MOD))
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define printv(a, b) {bool pvaspace=false; \
for(auto pva : a){ \
    if(pvaspace) b << " "; pvaspace=true;\
    b << pva;\
}\
b << "\n";}

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdd = pair<ld, ld>;
using tiii = tuple<int, int, int>;

const ll MOD = 1000000007;
const ll MAX = 2147483647;

template<typename A, typename B>
ostream& operator<<(ostream& o, pair<A, B> p){
    return o << '(' << p.F << ',' << p.S << ')';
}

ll ifloor(ll a, ll b){
    if(b < 0) a *= -1, b *= -1;
    if(a < 0) return (a - b + 1) / b;
    else return a / b;
}

ll iceil(ll a, ll b){
    if(b < 0) a *= -1, b *= -1;
    if(a > 0) return (a + b - 1) / b;
    else return a / b;
}

struct Tree{
    vector<set<int>> g;
    vector<ll> w;
    ll total = 0;
    ll sum = 0;
    explicit Tree(int n){
        g.resize(n);
        w.resize(n);
    }
    void addedge(int u, int v){
        g[u].insert(v);
        g[v].insert(u);
    }
    void addweight(int v){
        w[v]++;
        total++;
    }
    ll dfs(int now, int p){
        ll sz = w[now];
        for(int i : g[now]){
            if(i == p) continue;
            sz += dfs(i, now);
        }
        sum += sz * (total - sz);
        return sz;
    }
    ll calc(){
        dfs(0, 0);
        return sum;
    }
};

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

    map<int, vector<int>> vc, hc;
    for(int i = 0; i < n; i++){
        vc[X[i]].eb(Y[i]);
        hc[Y[i]].eb(X[i]);
    }

    map<pii, int> vid, hid;

    int vsz = -1, hsz = -1;
    for(auto& i : vc){
        int lst = -87;
        lsort(i.S);
        for(int j : i.S){
            if(j != lst + 1) vsz++;
            vid[mp(i.F, j)] = vsz;
            lst = j;
        }
    }
    for(auto& i : hc){
        int lst = -87;
        lsort(i.S);
        for(int j : i.S){
            if(j != lst + 1) hsz++;
            hid[mp(j, i.F)] = hsz;
            lst = j;
        }
    }
//    for(int i = 0; i < n; i++){
//        cerr << "city " << X[i] << " " << Y[i] << " " << vid[mp(X[i], Y[i])] << " " << hid[mp(X[i], Y[i])] << "\n";
//    }

    vsz++; hsz++;
    Tree vt(vsz), ht(hsz);

    for(auto i : vid){
        int x, y, id = i.S;
        tie(x, y) = i.F;
        vt.addweight(id);
        if(vid.find(mp(x + 1, y)) != vid.end()){
            vt.addedge(id, vid[mp(x + 1, y)]);
//            cerr << "v " << id << " " << vid[mp(x + 1, y)] << "\n";
        }
    }
    for(auto i : hid){
        int x, y, id = i.S;
        tie(x, y) = i.F;
        ht.addweight(id);
        if(hid.find(mp(x, y + 1)) != hid.end()){
            ht.addedge(id, hid[mp(x, y + 1)]);
//            cerr << "h " << id << " " << hid[mp(x, y + 1)] << "\n";
        }
    }

    ll ans = vt.calc() + ht.calc();

    return ans % 1000000000;
}

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