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답안 #561116

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
561116 2022-05-12T09:26:56 Z Zanite 꿈 (IOI13_dreaming) C++17
0 / 100
 70 ms 17864 KB 
#include "dreaming.h"

#include <bits/stdc++.h>
using namespace std;

#define pii pair<int, int>
#define fi first
#define se second

const int INF = 2e9;
const int maxN = 1e5 + 5;

void chmax(int &a, int b) {a = max(a, b);}
void chmin(int &a, int b) {a = min(a, b);}

struct Node {
    int child, lg;
    Node(int _child, int _lg) :
        child(_child),
        lg(_lg)
    {}

    bool operator < (const Node &other) const {
        return lg > other.lg;
    }
};

int N, M, L;
vector<pii> adj[maxN];
vector<Node> children[maxN];
int idx[maxN], longest[maxN], newLongest[maxN];

vector<int> curComponent, components;
void dfs(int cur, int par, int id) {
    idx[cur] = id;
	curComponent.push_back(cur);

    for (auto a : adj[cur]) {
        int nxt, w;
        tie(nxt, w) = a;
        if (nxt == par) continue;

        dfs(nxt, cur, id);
        chmax(longest[cur], longest[nxt] + w);
        children[cur].push_back(Node(nxt, longest[nxt] + w));
    }
}

void reroot(int cur, int par, int downwardsEdge) {
    if (par != -1) {
        // push "parent" as cur's child
        if (children[par][0].child == cur) {
            if (children[par].size() > 1) {
                children[cur].push_back(Node(par, children[par][1].lg + downwardsEdge));
            } else {
                children[cur].push_back(Node(par, downwardsEdge));
            }
            
        } else {
            children[cur].push_back(Node(par, children[par][0].lg + downwardsEdge));
        }
    }

	sort(children[cur].begin(), children[cur].end());

	// update newLongest
	for (auto c : children[cur]) {
		chmax(newLongest[cur], c.lg);
	}

	// go to children
	for (auto a : adj[cur]) {
		int nxt, w;
		tie(nxt, w) = a;
		if (nxt == par) continue;

		reroot(nxt, cur, w);
	}
}

void calculateTree(int root, int id) {
    // gather data about longest and children's longest for each node
	curComponent.clear();
    dfs(root, -1, id);

    // do reroot
    reroot(root, -1, -1);

	// find out the minimum newLongest of the component
	int curMin = INF;
	for (auto i : curComponent) {
		chmin(curMin, newLongest[i]);
	}
	components.push_back(curMin);
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    ::N = N, ::M = M, ::L = L;

    for (int i = 0; i < M; i++) {
        adj[A[i]].push_back({B[i], T[i]});
        adj[B[i]].push_back({A[i], T[i]});
    }

    for (int i = 0, cur = 1; i < N; i++) {
        if (idx[i] == 0) {
            calculateTree(i, cur);
            cur++;
        }
    }

	/*
	for (int i = 0; i < N; i++) {
		printf("%d: %d %d\n", i, idx[i], newLongest[i]);
	}
	*/

	sort(components.begin(), components.end());
	int s = components.size();

	int ans = components[s-1] + components[s-2] + L;
	if (s > 2) {
		chmax(ans, components[s-2] + components[s-3] + (L << 1));
	}
	return ans;
}

Subtask #1
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 70 ms 17864 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

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

Subtask #3
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 70 ms 17864 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 10596 KB Output is correct
2 Correct 32 ms 10592 KB Output is correct
3 Correct 44 ms 10948 KB Output is correct
4 Correct 34 ms 11044 KB Output is correct
5 Correct 36 ms 10980 KB Output is correct
6 Correct 34 ms 11584 KB Output is correct
7 Correct 35 ms 11272 KB Output is correct
8 Correct 32 ms 10936 KB Output is correct
9 Correct 31 ms 10888 KB Output is correct
10 Correct 33 ms 11176 KB Output is correct
11 Correct 3 ms 5008 KB Output is correct
12 Correct 7 ms 6608 KB Output is correct
13 Correct 7 ms 6736 KB Output is correct
14 Correct 7 ms 6676 KB Output is correct
15 Correct 7 ms 6608 KB Output is correct
16 Correct 8 ms 6608 KB Output is correct
17 Correct 7 ms 6224 KB Output is correct
18 Correct 8 ms 6736 KB Output is correct
19 Correct 7 ms 6608 KB Output is correct
20 Incorrect 3 ms 4948 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

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

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 70 ms 17864 KB Output isn't correct
2 Halted 0 ms 0 KB -