Submission #348408

#	Time	Username	Problem	Language	Result	Execution time	Memory
348408		daniel920712	Ideal city (IOI12_city)	C++14	32 / 100	1094 ms	5100 KiB

city

#include <map>
#include <utility>
#include <queue>
using namespace std;
vector < int > Next[100005];
int con[100005];
map < pair < int , int > , int > where;
int MOD=1000000000;
queue < pair < int , int > > BFS;
int DistanceSum(int N, int *X, int *Y)
{
    int ans=0,x,y,i,j;
    for(i=0;i<N;i++) where[make_pair(X[i],Y[i])]=i;
    for(i=0;i<N;i++)
    {
        if(where.find(make_pair(X[i]+1,Y[i]))!=where.end()) Next[i].push_back(where[make_pair(X[i]+1,Y[i])]);
        if(where.find(make_pair(X[i]-1,Y[i]))!=where.end()) Next[i].push_back(where[make_pair(X[i]-1,Y[i])]);
        if(where.find(make_pair(X[i],Y[i]+1))!=where.end()) Next[i].push_back(where[make_pair(X[i],Y[i]+1)]);
        if(where.find(make_pair(X[i],Y[i]-1))!=where.end()) Next[i].push_back(where[make_pair(X[i],Y[i]-1)]);
    }
    for(i=0;i<N;i++)
    {
        for(j=0;j<N;j++) con[j]=-1;
        BFS.push(make_pair(i,0));
        while(!BFS.empty())
        {
            x=BFS.front().first;
            y=BFS.front().second;
            BFS.pop();
            if(con[x]!=-1) continue;
            con[x]=y;
            if(i<x)
            {
                ans+=y;
                if(ans>MOD) ans-=MOD;
            }
            for(auto k:Next[x]) BFS.push(make_pair(k,y+1));
        }
    }
    return ans;

}

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