Submission #597479

#	Time	Username	Problem	Language	Result	Execution time	Memory
597479		Hanksburger	Ideal city (IOI12_city)	C++17	100 / 100	61 ms	10672 KiB

city

#include <bits/stdc++.h>
using namespace std;
vector<pair<pair<int, int>, int> > b[100005];
vector<int> adj[100005], w;
vector<pair<int, int> > a;
long long ans;
int n;
long long dfs(int u, int p)
{
    long long sum=w[u];
    for (int v:adj[u])
    {
        if (v!=p)
        {
            long long x=dfs(v, u);
            ans=(ans+x*(n-x))%1000000000;
            sum+=x;
        }
    }
    return sum;
}
int DistanceSum(int N, int *X, int *Y)
{
    n=N;
    for (int z=0; z<2; z++)
    {
        int mn=2147483647, sz=0, cnt=0;
        for (int i=0; i<n; i++)
        {
            mn=min(mn, X[i]);
            sz=max(sz, X[i]);
        }
        sz-=mn;
        for (int i=0; i<n; i++)
            a.push_back({X[i]-mn, Y[i]});
        sort(a.begin(), a.end());
        for (int i=0; i<n; )
        {
            int ind=i+1;
            while (ind<n && a[i].first==a[ind].first && a[ind-1].second+1==a[ind].second)
                ind++;
            w.push_back(a[ind-1].second-a[i].second+1);
            b[a[i].first].push_back({{a[i].second, a[ind-1].second}, cnt++});
            i=ind;
        }
        for (int i=0; i<sz; i++)
        {
            int ind=0;
            for (int j=0; j<b[i].size(); j++)
            {
                while (ind<b[i+1].size() && b[i+1][ind].first.second<b[i][j].first.first)
                    ind++;
                while (ind<b[i+1].size() && b[i+1][ind].first.first<=b[i][j].first.second)
                {
                    int u=b[i][j].second, v=b[i+1][ind].second;
                    adj[u].push_back(v);
                    adj[v].push_back(u);
                    ind++;
                }
                ind=max(0, ind-1);
            }
        }
        dfs(0, 0);
        for (int i=0; i<n; i++)
            swap(X[i], Y[i]);
        a.clear();
        w.clear();
        for (int i=0; i<=sz; i++)
            b[i].clear();
        for (int i=0; i<cnt; i++)
            adj[i].clear();
    }
    return ans;
}

Compilation message (stderr)

city.cpp: In function 'int DistanceSum(int, int*, int*)':
city.cpp:49:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |             for (int j=0; j<b[i].size(); j++)
      |                           ~^~~~~~~~~~~~
city.cpp:51:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |                 while (ind<b[i+1].size() && b[i+1][ind].first.second<b[i][j].first.first)
      |                        ~~~^~~~~~~~~~~~~~
city.cpp:53:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |                 while (ind<b[i+1].size() && b[i+1][ind].first.first<=b[i][j].first.second)
      |                        ~~~^~~~~~~~~~~~~~

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