Submission #829832

#	Time	Username	Problem	Language	Result	Execution time	Memory
829832		FatihSolak	Circle selection (APIO18_circle_selection)	C++17	0 / 100	2871 ms	171308 KiB

circle_selection

#include <bits/stdc++.h>
#define N 100005
using namespace std;
int x[N],y[N],c[N];
int ans[N];
void solve(){
    int n;
    cin >> n;
    vector<int> ord;
    for(int i = 1;i<=n;i++){
        cin >> x[i] >> y[i] >> c[i];
        ord.push_back(i);
    }
    sort(ord.begin(),ord.end(),[&](int a,int b){
        if(c[a] == c[b])
            return a < b;
        return c[a] > c[b];
    });
    set<pair<long long,int>> s[3][3][3];
    for(auto u:ord){
        int num = -1;
        vector<int> cand;
        for(int i = -1;i<=1;i++){
            for(int j = -1;j<=1;j++){
                for(int k = -1;k<=1;k++){
                    long long sum = 0;
                    sum += i * x[u];
                    sum += j * y[u];
                    sum += k * c[u];
                    auto it = s[i + 1][j + 1][k + 1].lower_bound({sum,0});
                    if(it != s[i+1][j+1][k+1].end()){
                        cand.push_back(it->second);
                    }
                    if(it != s[i+1][j+1][k+1].begin()){
                        cand.push_back(prev(it)->second);
                    }
                }
            }
        }
        for(auto cc:cand){
            long long val1 = (long long)(c[u] + c[cc]) *(c[u] + c[cc]);
            long long val2 =  (long long)(x[u] - x[cc]) *(x[u] - x[cc])
            + (long long)(y[u] - y[cc]) *(y[u] - y[cc]);
            if(val2 <= val1){
                if(num == -1 || u < num)
                    num = cc;
            }
        }
        if(num == -1){
            ans[u] = u;
            for(int i = -1;i<=1;i++){
                for(int j = -1;j<=1;j++){
                    for(int k = -1;k<=1;k++){
                        long long sum = 0;
                        sum += i * x[u];
                        sum += j * y[u];
                        sum += k * c[u];
                        s[i + 1][j + 1][k + 1].insert({sum,u});
                    }
                }
            }
        }
        else ans[u] = num;
    }
    for(int i = 1;i<=n;i++){
        cout << ans[i] << ' ';
    }
}
    
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    #ifdef Local    
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
    #endif
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 30
• Subtask 6: 0 / 13