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답안 #575658

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
575658 2022-06-11T07:25:19 Z Mazaalai 꿈 (IOI13_dreaming) C++17
18 / 100
 1000 ms 11756 KB 
#include "dreaming.h"
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define ALL(x) x.begin(),x.end()
using namespace std;
using VI = vector <int>;
using PII = pair <int, int>;
const int N = 1e5+5;
vector <PII> paths[N];
bool vis[N];
int n, m, L, sizes[N], len;
PII dp[N];
 
PII getFarthest(int pos, int par = 0) {
    dp[pos] = {0, pos};
    for (auto [a, b] : paths[pos]) {
        if (a == par) continue;
        PII tmp = getFarthest(a, pos);
        if (dp[pos].ff < tmp.ff + b) dp[pos] = {tmp.ff + b, tmp.ss};
    }
    return dp[pos];
}
int getSizes(int pos, int par = 0) {
    vis[pos] = 1;
    for (auto [a, b] : paths[pos]) {
        if (a == par) continue;
        sizes[pos] = max(sizes[pos], b + getSizes(a, pos));
    }
    return sizes[pos];
}
VI findCentroid(int pos, int par = 0, int pre = 0) {
    int suf = len - pre;
    VI res = {pos, pre, suf};
    for (auto [a, b] : paths[pos]) {
        if (a == par) continue;
        int x = pre+b, y = sizes[a];
        if (max(pre, suf) >= max(x, y)) {
            VI tmp = findCentroid(a, pos, pre+b);
            if (max(pre, suf) > max(tmp[1], tmp[2])) res = tmp;
        }
    }
    return res;
}
VI getCentroid(int pos) {
    len = getSizes(pos);
    return findCentroid(pos);
}
stack <int> stk;
void dfs(int pos, int par = 0) {
    vis[pos] = 1;
    stk.push(pos);
    for (auto [a, b] : paths[pos]) {
        if (a == par) continue;
        dfs(a, pos);
    }
}
int dbg = 0;
PII calc(int pos) {
    queue <VI> bfs; bfs.push({pos, 0, 0});
    VI maxi = {0, 0, 0};
    while(!bfs.empty()) {
        int u, par, c; VI x = bfs.front();
        bfs.pop();
        u = x[0], par = x[1], c = x[2];
        maxi[0] = c;
        sort(ALL(maxi));
        // cout << u << ' ' << par << ' ' << c << '\n';
        // if (dbg++ > 10) exit(0);
        for (auto [v, w] : paths[u]) {
            if (par == v) continue;
            bfs.push({v, u, c+w});
        }
    }
    return {maxi[1], maxi[2]};
}
PII get() {
    PII res = {1e9, 1e9};
    while(!stk.empty()) {
        int x = stk.top(); stk.pop();
        PII tmp = calc(x);
        if (tmp.ff > tmp.ss) swap(tmp.ff, tmp.ss);
        res = min(res, tmp);
    }
    return res;
}

int travelTime(int _N, int _M, int _L, int _A[], int _B[], int _T[]) {
    n = _N;
    m = _M;
    L = _L;
    vector <PII> pts;
    for (int i = 0; i < _M; i++) {
        // paths[_A[i]].pb({_B[i], _T[i]});
        // paths[_B[i]].pb({_A[i], _T[i]});
        paths[_A[i]+1].pb({_B[i]+1, _T[i]});
        paths[_B[i]+1].pb({_A[i]+1, _T[i]});
    }
    for (int i = 1; i <= n; i++) {
        if (vis[i]) continue;
        dfs(i);
        PII tmp = get();
        if (tmp.ff > tmp.ss) swap(tmp.ff, tmp.ss);
        pts.pb(tmp);
        // // cout << i-1 << ": " << point[0]-1 << ' ' << point[1] << ' ' << point[2] << '\n';
        // // cout << i << ": " << point[0] << ' ' << point[1] << ' ' << point[2] << '\n';
    }
    sort(ALL(pts), [&](auto&a, auto&b) {
        return max(a.ff, a.ss) < max(b.ff, b.ss);
    });
    sort(ALL(pts));
    n = pts.size();
    for (int i = n-2; i >= 0; i--) {
        PII&a = pts[n-1];
        PII&b = pts[i];
        if (a.ff > a.ss) swap(a.ff, a.ss);
        if (b.ff > b.ss) swap(b.ff, b.ss);
        VI x = {a.ff, a.ss, b.ss+L};
        VI y = {b.ff, b.ss, a.ss+L};
        sort(ALL(x));
        sort(ALL(y));
        a = {x[1], x[2]};
        b = {y[1], y[2]};
        a = max(a, b);
    }
    return pts[n-1].ff+pts[n-1].ss;
    return 0;
}

Subtask #1
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1072 ms 11756 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Incorrect 3 ms 2644 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1072 ms 11756 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 39 ms 5992 KB Output is correct
2 Correct 40 ms 5968 KB Output is correct
3 Correct 39 ms 5964 KB Output is correct
4 Correct 40 ms 6068 KB Output is correct
5 Correct 38 ms 5968 KB Output is correct
6 Correct 42 ms 6604 KB Output is correct
7 Correct 40 ms 6136 KB Output is correct
8 Correct 36 ms 6004 KB Output is correct
9 Correct 38 ms 5884 KB Output is correct
10 Correct 38 ms 6028 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 25 ms 3944 KB Output is correct
13 Correct 23 ms 3956 KB Output is correct
14 Correct 26 ms 3916 KB Output is correct
15 Correct 25 ms 3856 KB Output is correct
16 Correct 26 ms 3916 KB Output is correct
17 Correct 23 ms 3916 KB Output is correct
18 Correct 23 ms 3904 KB Output is correct
19 Correct 23 ms 3916 KB Output is correct
20 Correct 1 ms 2668 KB Output is correct
21 Correct 1 ms 2668 KB Output is correct
22 Correct 2 ms 2672 KB Output is correct
23 Correct 25 ms 3836 KB Output is correct

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Incorrect 3 ms 2644 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1072 ms 11756 KB Time limit exceeded
2 Halted 0 ms 0 KB -