結果
| 問題 | 
                            No.898 tri-βutree
                             | 
                    
| コンテスト | |
| ユーザー | 
                             nasadigital
                         | 
                    
| 提出日時 | 2019-10-04 22:37:22 | 
| 言語 | C++14  (gcc 13.3.0 + boost 1.87.0)  | 
                    
| 結果 | 
                             
                                TLE
                                 
                             
                            
                         | 
                    
| 実行時間 | - | 
| コード長 | 1,952 bytes | 
| コンパイル時間 | 1,841 ms | 
| コンパイル使用メモリ | 171,772 KB | 
| 実行使用メモリ | 36,520 KB | 
| 最終ジャッジ日時 | 2024-10-03 08:08:05 | 
| 合計ジャッジ時間 | 12,674 ms | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge4 / judge1 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | -- * 1 | 
| other | TLE * 1 -- * 20 | 
コンパイルメッセージ
In function 'll pathSum(int, int, int)',
    inlined from 'int main()' at main.cpp:73:51:
main.cpp:38:26: warning: 't' may be used uninitialized [-Wmaybe-uninitialized]
   38 |     return tot[a] + tot[b] - 2 * tot[p];
      |                     ~~~~~^
main.cpp: In function 'int main()':
main.cpp:64:19: note: 't' was declared here
   64 |         int f, s, t;
      |                   ^
main.cpp:71:35: warning: 's' may be used uninitialized [-Wmaybe-uninitialized]
   71 |         int smallTree = findParent(f, s);
      |                         ~~~~~~~~~~^~~~~~
main.cpp:64:16: note: 's' was declared here
   64 |         int f, s, t;
      |                ^
main.cpp:71:35: warning: 'f' may be used uninitialized [-Wmaybe-uninitialized]
   71 |         int smallTree = findParent(f, s);
      |                         ~~~~~~~~~~^~~~~~
main.cpp:64:13: note: 'f' was declared here
   64 |         int f, s, t;
      |             ^
            
            ソースコード
#include <bits/stdc++.h>
#define MAX_SIZE 100000
#define LOG_SIZE 17
using namespace std;
typedef long long ll;
typedef pair<int,int> ii;
vector<ii> adjList[MAX_SIZE];
int lcs[MAX_SIZE][LOG_SIZE], lvl[MAX_SIZE];
ll tot[MAX_SIZE];
void dfs(int cur, ll sum, int p, int cd) {
    tot[cur] = sum;
    lcs[cur][0] = p;
    lvl[cur] = cd;
    for (auto nxt : adjList[cur])
        if (nxt.first != p)
            dfs(nxt.first, sum + nxt.second, cur, cd + 1);
}
int findParent(int a, int b) {
    if (lvl[a] > lvl[b]);
        swap(a, b);
    for (int ctr1 = 0; ctr1 < LOG_SIZE; ++ctr1)
        if ((lvl[b] - lvl[a]) & (1 << ctr1))
            b = lcs[b][ctr1];
    if (a == b)
        return a;
    for (int ctr1 = lvl[a] - 1; ctr1 >= 0; --ctr1)
        if (lcs[a][ctr1] != lcs[b][ctr1])
            a = lcs[a][ctr1], b = lcs[b][ctr1];
    return lcs[a][0];
}
ll pathSum(int a, int b, int p) {
    return tot[a] + tot[b] - 2 * tot[p];
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, q;
    cin >> n;
    int a, b, c;
    for (int ctr1 = 1; ctr1 < n; ++ctr1) {
        cin >> a >> b >> c;
        adjList[a].push_back({b, c});
        adjList[b].push_back({a, c});
    }
    dfs(0, 0, 0, 0);
    for (int ctr1 = 1; ctr1 < LOG_SIZE; ++ctr1)
        for (int ctr2 = 0; ctr2 < n; ++ctr2)
            lcs[ctr2][ctr1] = lcs[lcs[ctr2][ctr1 - 1]][ctr1 - 1];
    cin >> q;
    for (int ctr1 = 0; ctr1 < q; ++ctr1) {
        cin >> a >> b >> c;
        int ab = findParent(a, b);
        int bc = findParent(b, c);
        int ac = findParent(a, c);
        int f, s, t;
        if (ab == bc)
            f = a, s = c, t = b;
        if (bc == ac)
            f = a, s = b, t = c;
        if (ab == ac)
            f = b, s = c, t = a;
        int smallTree = findParent(f, s);
        int bigTree = findParent(smallTree, t);
        cout << pathSum(f, s, smallTree) + pathSum(smallTree, t, bigTree) << "\n";
    }
    return 0;
}
            
            
            
        
            
nasadigital