답안 #834800

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
834800	2023-08-22T19:45:31 Z	Ozy	Designated Cities (JOI19_designated_cities)	C++17	9 / 100	223 ms	51384 KB

designated_cities

#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i = (a); i <= (b); i++)
#define repa(i,a,b) for(int i = (a); i >= (b); i--)
#define lli long long int
#define debug(a) cout << #a << " = " << a << endl
#define debugsl(a) cout << #a << " = " << a << ", "
    
#define MAX 200000
    
struct x {
    lli des;
    lli w;
    lli comp;
};
    
lli n,a,b,c,d,raiz,op,total,q;
vector<x> hijos[MAX+2];
lli sub[MAX+2],h_op[MAX+2];
    
void pre_dfs(lli pos, lli padre) {
    for(auto h : hijos[pos]) {
        if(h.des == padre) continue;
        pre_dfs(h.des,pos);
        sub[pos] += sub[h.des] + (h.comp-h.w);
    }
}
    
void busca_raiz(lli pos, lli padre,lli carga) {
    lli a;
    vector<lli> mejores;
    
    for(auto h : hijos[pos]){
        if(h.des == padre) continue;
        
        a = carga + sub[pos] - sub[h.des];
        a -= (h.comp-h.w);
        a += h.w;
        busca_raiz(h.des,pos,a);
        
        mejores.push_back(h_op[h.des]+h.w);
    }
    sort(mejores.begin(), mejores.end());
    reverse(mejores.begin(), mejores.end());

    lli cont = 0;
    a = carga + sub[pos];
    for(auto m : mejores) {
        if (cont == 2) break;
        cont++;
        a += m;
    }

    op = max(a,op);
    if(!mejores.empty()) h_op[pos] = mejores[0];
}
    
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    cin >> n;
    rep(i,1,n-1) {
        cin >> a >> b >> c >> d;
        hijos[a].push_back({b,c,c+d});
        hijos[b].push_back({a,d,c+d});
        total += (c+d);
    }
    
    pre_dfs(1,0);
    busca_raiz(1,0,0);
    
    cin >> q >> a;
    cout << (total-op) << "\n";
    
    return 0;  
}

Subtask #1
0 / 6.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	3 ms	4948 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #2
0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	2 ms	5028 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #3
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	5020 KB	Output is correct
2	Correct	223 ms	21760 KB	Output is correct
3	Correct	198 ms	51384 KB	Output is correct
4	Correct	150 ms	26192 KB	Output is correct
5	Correct	155 ms	28116 KB	Output is correct
6	Correct	179 ms	31144 KB	Output is correct
7	Correct	112 ms	28952 KB	Output is correct
8	Correct	196 ms	40828 KB	Output is correct
9	Correct	111 ms	25672 KB	Output is correct