Submission #621340

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
621340	2022-08-03 17:48:16	Bench0310	Fountain Parks (IOI21_parks)	C++17	100 / 100	1939 ms	92860 KiB

parks

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include <bits/stdc++.h>
#include "parks.h"
using namespace std;
typedef long long ll;
int construct_roads(vector<int> x,vector<int> y)
{
    int n=x.size();
    map<array<int,2>,int> id;
    for(int i=0;i<n;i++) id[{x[i],y[i]}]=i;
    map<array<int,2>,int> bench_id;
    int m=0;
    auto fountain_pos=[&](int a,int b)->int{return (id.find({a,b})!=id.end()?id[{a,b}]:-1);};
    auto tp=[&](int a,int b)->int{return (((a+b)/2)&1);}; //color of chessboard at this bench
    for(int i=0;i<n;i++)
    {
        int a=x[i],b=y[i];
        if(fountain_pos(a+2,b)!=-1&&fountain_pos(a,b+2)!=-1&&fountain_pos(a+2,b+2)!=-1)
        {
            bench_id[{a+1,b+1}]=(++m);
        }
    }
    auto bench_pos=[&](int a,int b)->int{return (bench_id.find({a,b})!=bench_id.end()?bench_id[{a,b}]:0);};
    vector<array<int,3>> g[m+1]; //to,bad_a,bad_b
    for(auto [p,bench]:bench_id)
    {
        auto [a,b]=p;
        if(tp(a,b)==0)
        {
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30