Submission #1021770

#	Time	Username	Problem	Language	Result	Execution time	Memory
1021770		vjudge1	Ideal city (IOI12_city)	C++17	34 / 100	1028 ms	2080 KiB

city

#include<bits/stdc++.h>
using namespace std;
int mod=1e9;
long long ANS;
set<pair<int,int>>st;
queue<tuple<int,int,int>>q;
void flod(){
    if(q.empty())return;
    auto[x,y,d]=q.front();
    q.pop();
    if(!st.count({x,y}))return flod();
    st.erase({x,y});
    ANS+=d;
    q.emplace(x-1,y,d+1);
    q.emplace(x+1,y,d+1);
    q.emplace(x,y-1,d+1);
    q.emplace(x,y+1,d+1);
    flod();
}
int DistanceSum(int N, int *X, int *Y) {
    if(N>2000){
        sort(X,X+N);
        sort(Y,Y+N);
        long long ans=0;
        for(long long i=0;i<N;i++){
            ans+=i*X[i] - (N-i-1) *X[i];
            ans%=mod;
        }
        for(long long i=0;i<N;i++){
            ans+=i*Y[i] - (N-i-1) *Y[i];
            ans%=mod;
        }
        return (ans+mod)%mod;
    }
    int A=*min_element(Y,Y+N);
    int B=*min_element(X,X+N);
    for(int i=0;i<N;i++)
        st.insert({X[i]-=B,Y[i]-=A});
    set<pair<int,int>>st2=st;
    for(int i=0;i<N;i++){
        q.emplace(X[i],Y[i],0);
        flod();
        st=st2;
    }
    return ANS/2%mod;
}

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