Submission #525127

#	Time	Username	Problem	Language	Result	Execution time	Memory
525127		ali22413836	Countries (BOI06_countries)	C++14	10 / 100	11 ms	6092 KiB

countries

#include <bits/stdc++.h>
//#define  endl "\n"
using namespace std ;
typedef long long ll;
typedef long double ld ;
const int N=2e7;
const ll inf=1e18 ;
const ll mod = 1e9 + 7 ;
ll mypower(ll x, ll y){
    if(y == 0) return 1 ;
    if(y == 1) return x ;
    ll ret = mypower(x , y / 2);
    ret = (ret * ret) % mod;
    if(y % 2) ret = ( ret * x ) % mod ;
    return ret ;
}
ll n , x[20000] , y[200009] , s[200009] , in[200009] , di[200009] ;
bool vis[1009][1009] , from2[200009] ;
vector < ll > v[200009] ;
void dfs(ll node , ll root){
    if(vis[node][root])
        return ;
    vis[node][root] = 1 ;
    if(di[node] != -1){
        from2[node] = 1 ;
    }
    else{
        di[node] = root ;
    }
    for(auto p : v[node]){
        if(vis[p][root] == 0){
            ll q = (x[node] - x[p]) * (x[node] - x[p]) + (y[node] - y[p]) * (y[node] - y[p]) ;
            ll e = s[root]/ q ;
            if(e > s[p])
                dfs(p , root) ;
        }
    }
}
int main(){
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n ;
    for(int i = 0 ; i < n ; i++){
        cin >> x[i] >> y[i] >> s[i] ;
        di[i] = -1 ;
    }
    for(int i = 0 ; i < n ; i++){
        for(int j = 0; j < n ; j++){
            if(i == j)
                continue ;
            ll q = (x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]) ;
            ll e = s[j] / q ;
            if(e > s[i]){
                v[j].push_back(i) ;
                in[i]++ ;
            }
        }
    }
    for(int i = 0 ; i < n ; i++){
        if(in[i] == 0){
            dfs(i , i) ;
        }
    }
    for(int i = 0 ; i < n ; i++){
        if(di[i] == i){
            cout << "K" << endl ;
        }
        else if(from2[i] == 1){
            cout << "D" << endl ;
        }
        else{
            cout << di[i] + 1 << endl;
        }
    }
    return 0 ;
}
/*
5
2 5 14
2 3 2
3 2 7
1 1 2
2 1 3
*/

• Subtask 1: 10 / 100