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 1.89.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 1,952 bytes |
| 記録 | |
| 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