結果
| 問題 |
No.3237 Find the Treasure!
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2025-08-15 22:26:19 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 332 ms / 3,000 ms |
| コード長 | 2,644 bytes |
| コンパイル時間 | 4,254 ms |
| コンパイル使用メモリ | 257,708 KB |
| 実行使用メモリ | 26,212 KB |
| 平均クエリ数 | 13.83 |
| 最終ジャッジ日時 | 2025-08-15 22:26:43 |
| 合計ジャッジ時間 | 12,679 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge6 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 22 |
ソースコード
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using isize = size_t;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
using i128 = __int128_t;
using u128 = __uint128_t;
using f64 = long double;
using p2 = pair<i64, i64>;
using el = tuple<i64, i64, i64>;
using mint = atcoder::modint998244353;
void _main();
int main() {
cin.tie(0);
ios::sync_with_stdio(false);
_main();
}
i64 pow(i64 x, i64 n) {
i64 res = 1;
i64 t = x;
while (n > 0) {
if (n & 1) {
res = res * t;
}
t = t * t;
n >>= 1;
}
return res;
}
i64 pow(i64 x, i64 n, i64 m) {
i64 res = 1;
i64 t = x % m;
while (n > 0) {
if (n & 1) {
res = res * t % m;
}
t = t * t % m;
n >>= 1;
}
return res;
}
vector<p2> g[10000];
p2 edge[10000];
i64 dep[10000];
void dfs(i64 v, i64 par) {
for (auto [nv, i] : g[v]) {
if (nv == par) continue;
dep[nv] = dep[v] + 1;
if (dep[v] % 2 == 0) edge[i] = {v, nv};
else edge[i] = {nv, v};
dfs(nv, v);
}
}
void _main() {
i64 n;
cin >> n;
for (i64 i = 0; i < n - 1; i++) {
i64 u, v;
cin >> u >> v;
u--, v--;
g[u].push_back({v, i});
g[v].push_back({u, i});
}
dep[0] = 0;
dfs(0, -1);
vector<bool> ng(n, false);
{
cout << "? ";
for (i64 i = 0; i < n - 1; i++) {
auto [u, v] = edge[i];
cout << u + 1 << " ";
}
cout << "\n";
cout.flush();
string s;
cin >> s;
if (s == "Yes") {
for (i64 i = 0; i < n; i++) {
if (dep[i] % 2 == 1) ng[i] = true;
}
} else {
for (i64 i = 0; i < n; i++) {
if (dep[i] % 2 == 0) ng[i] = true;
}
}
}
while (true) {
vector<i64> v;
for (i64 i = 0; i < n; i++) {
if (!ng[i]) v.push_back(i);
}
if (v.size() == 1) break;
i64 m = v.size() / 2;
vector<i64> p(n, 0);
for (i64 i = m; i < v.size(); i++) {
p[v[i]] = 1;
}
cout << "? ";
for (i64 i = 0; i < n - 1; i++) {
auto [u, v] = edge[i];
assert(p[u] != 1 || p[v] != 1);
if (p[u] == 1) {
cout << v + 1 << " ";
} else if (p[v] == 1) {
cout << u + 1 << " ";
} else if (!ng[u]) {
cout << u + 1 << " ";
} else {
cout << v + 1 << " ";
}
}
cout << "\n";
cout.flush();
string s;
cin >> s;
if (s == "Yes") {
for (i64 i = m; i < v.size(); i++) ng[v[i]] = true;
} else {
for (i64 i = 0; i < m; i++) ng[v[i]] = true;
}
}
for (i64 i = 0; i < n; i++) {
if (!ng[i]) {
cout << "! " << i + 1 << "\n";
cout.flush();
}
}
}