Submission #61807

#	Time	Username	Problem	Language	Result	Execution time	Memory
61807		zetapi	Ideal city (IOI12_city)	C++14	23 / 100	406 ms	69540 KiB

city

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

#define pb  push_back
#define mp  make_pair
#define ll  long long
#define itr ::iterator 

typedef pair<ll,ll>  pii;

const ll MAX=1e6;
const ll mod=1e9;

vector<pii> vec;

set<ll> adj[MAX];

ll res,value[MAX],sum[MAX],dp[MAX];

void dfs(int node,int par)
{
	//cout<<node<<" "<<value[node]<<" dfs \n";
	for(auto A:adj[node])
	{
		if(A==par)
			continue;
		dfs(A,node);
		sum[node]+=sum[A];
		sum[node]%=mod;
		dp[node]+=dp[A];
		dp[node]%=mod;
	}
	//cout<<"sum "<<node<<" "<<sum[node]<<"\n";
	dp[node]+=sum[node];
	dp[node]%=mod;
	sum[node]+=value[node];
	sum[node]%=mod;
	res+=(dp[node]*value[node])%mod;
	res%=mod;
	return ;
}

void cal(int N,int *X,int *Y)
{
	for(int A=1;A<=N;A++)
	{
		dp[A]=0;
		sum[A]=0;
		value[A]=0;
		adj[A].clear();
	}
	int ptr=0;
	vector<pii> vec;
	map<pii,int> mark;
	for(int A=0;A<N;A++)
		vec.pb(mp(X[A],Y[A]));
	vec.pb(mp(0,0));
	sort(vec.begin(),vec.end());
	for(int A=1;A<vec.size();A++)
	{
		if(vec[A].first==vec[A-1].first and vec[A].second==vec[A-1].second+1)
		{
			value[ptr]++;
			mark[mp(vec[A].first,vec[A].second)]=ptr;
		}
		else
		{
			value[++ptr]++;
			mark[mp(vec[A].first,vec[A].second)]=ptr;		
		}
		//cout<<vec[A].first<<" "<<vec[A].second<<" "<<mark[vec[A]]<<"\n";
	}
	for(int A=1;A<vec.size();A++)
	{
		if(mark[mp(vec[A].first-1,vec[A].second)])
		{
			adj[mark[vec[A]]].insert(mark[mp(vec[A].first-1,vec[A].second)]);
			adj[mark[mp(vec[A].first-1,vec[A].second)]].insert(mark[vec[A]]);
			//cout<<mark[vec[A]]<<" "<<mark[mp(vec[A].first-1,vec[A].second)]<<"\n";
		}
	}
	dfs(1,0);
	return ;
}

int DistanceSum(int N, int *X, int *Y) 
{
	cal(N,X,Y);
	for(int A=0;A<N;A++)
		swap(X[A],Y[A]);
	cal(N,X,Y);
	return res;
}

/*signed main()
{
	ios_base::sync_with_stdio(false);

	int X[]={1,1,2,2};
	int Y[]={1,2,1,2};
	cout<<DistanceSum(4,X,Y);
	return 0;
}*/

Compilation message (stderr)

city.cpp: In function 'void cal(int, int*, int*)':
city.cpp:59:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int A=1;A<vec.size();A++)
              ~^~~~~~~~~~~
city.cpp:73:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int A=1;A<vec.size();A++)
              ~^~~~~~~~~~~

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