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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#182558 | #4896. Alice、Bob 与 DFS | hos_lyric# | 0 | 1ms | 3988kb | C++14 | 4.5kb | 2023-09-18 07:55:53 | 2024-07-04 02:01:53 |
answer
#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;
using Int = long long;
template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")
int N;
vector<int> C;
vector<int> deg;
vector<vector<int>> graph;
int K;
vector<int> R;
namespace brute {
// state: just determined to call dfs(stack.back().first)
map<vector<pair<int, int>>, int> cache;
int calc(const vector<pair<int, int>> &stack) {
auto it = cache.find(stack);
if (it != cache.end()) return it->second;
set<int> app;
for (auto ujs = stack; ; ujs.pop_back()) {
if (ujs.empty()) {
app.insert(0);
goto done;
}
const int u = ujs.back().first;
for (int &j = ujs.back().second; ++j < deg[u]; ) {
auto vjs = ujs;
vjs.emplace_back(graph[u][j], -1);
app.insert(calc(vjs));
if (!C[u]) {
goto done;
}
}
}
done:{}
int ret;
for (ret = 0; app.count(ret); ++ret) {}
#ifdef LOCAL
cerr<<"calc "<<stack<<" = "<<ret<<endl;
#endif
return cache[stack] = ret;
}
int run() {
cache.clear();
int ans = 0;
for (const int r : R) {
ans ^= calc({make_pair(r, -1)});
}
return ans;
}
} // brute
namespace sub4 {
vector<int> dp;
set<int> us;
vector<int> freq;
priority_queue<int, vector<int>, greater<int>> que0, que1;
void add(int u) {
us.insert(u);
if (!freq[dp[u]]++) {
que1.push(dp[u]);
}
}
void rem(int u) {
assert(us.erase(u));
if (!--freq[dp[u]]) {
que0.push(dp[u]);
}
}
int get() {
for (; !que1.empty() && que0.top() == que1.top(); que0.pop(), que1.pop()) {}
return que0.top();
}
void dfs(int u) {
for (int j = deg[u]; --j >= 0; ) {
dfs(graph[u][j]);
}
dp[u] = get();
// cerr<<u<<": "<<dp[u]<<"; ";pv(us.begin(),us.end());
for (const int v : graph[u]) {
rem(v);
}
add(u);
}
int run() {
vector<int> par(N, -1);
for (int u = 0; u < N; ++u) {
for (const int v : graph[u]) {
par[v] = u;
}
}
freq.assign(N + 1, 0);
que0 = {};
que1 = {};
for (int x = 0; x <= N + 1; ++x) {
que0.push(x);
}
dp.assign(N + 1, 0);
for (int u = 0; u < N; ++u) if (!~par[u]) {
add(N);
dfs(u);
for (const int v : us) {
rem(v);
}
}
int ans = 0;
for (const int r : R) {
ans ^= dp[r];
}
return ans;
}
} // sub4
int main() {
for (; ~scanf("%d", &N); ) {
C.resize(N);
for (int u = 0; u < N; ++u) {
scanf("%d", &C[u]);
}
deg.resize(N);
graph.resize(N);
for (int u = 0; u < N; ++u) {
scanf("%d", °[u]);
graph[u].resize(deg[u]);
for (int j = 0; j < deg[u]; ++j) {
scanf("%d", &graph[u][j]);
--graph[u][j];
}
}
scanf("%d", &K);
R.resize(K);
for (int k = 0; k < K; ++k) {
scanf("%d", &R[k]);
--R[k];
}
vector<int> indeg(N, 0);
for (int u = 0; u < N; ++u) {
for (const int v : graph[u]) {
++indeg[v];
}
}
bool spe4 = true;
spe4 = spe4 && (C == vector<int>(N, 1));
for (int u = 0; u < N; ++u) {
spe4 = spe4 && (indeg[u] <= 1);
}
for (const int r : R) {
spe4 = spe4 && (indeg[r] <= 0);
}
int ans = -1;
if (spe4) {
cerr<<"sub4"<<endl;
ans = sub4::run();
} else {
ans = brute::run();
}
puts(ans ? "Alice" : "Bob");
#ifdef LOCAL
brute::run();
#endif
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 0
Memory Limit Exceeded
Test #1:
score: 0
Memory Limit Exceeded
input:
1000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...
output:
result:
Subtask #2:
score: 0
Runtime Error
Test #18:
score: 15
Accepted
time: 1ms
memory: 3692kb
input:
7 0 0 1 1 0 1 1 1 2 2 3 4 0 2 5 6 0 1 7 0 1 1
output:
Bob
result:
ok "Bob"
Test #19:
score: 0
Accepted
time: 1ms
memory: 3752kb
input:
6 0 1 0 0 1 0 2 2 6 3 3 4 5 0 0 0 0 1 1
output:
Bob
result:
ok "Bob"
Test #20:
score: 0
Accepted
time: 1ms
memory: 3752kb
input:
3 0 1 0 1 2 1 3 0 1 1
output:
Bob
result:
ok "Bob"
Test #21:
score: -15
Runtime Error
input:
10 1 1 1 1 1 1 1 1 1 1 1 2 4 3 5 7 8 1 4 0 1 6 0 0 1 9 1 10 0 1 1
output:
result:
Subtask #3:
score: 0
Runtime Error
Test #55:
score: 15
Accepted
time: 1ms
memory: 3752kb
input:
7 0 0 1 1 0 1 1 1 2 2 3 4 0 2 5 6 0 1 7 0 1 1
output:
Bob
result:
ok "Bob"
Test #56:
score: 0
Accepted
time: 0ms
memory: 3988kb
input:
6 0 1 0 0 1 0 2 2 6 3 3 4 5 0 0 0 0 1 1
output:
Bob
result:
ok "Bob"
Test #57:
score: 0
Accepted
time: 1ms
memory: 3704kb
input:
3 0 1 0 1 2 1 3 0 1 1
output:
Bob
result:
ok "Bob"
Test #58:
score: -15
Runtime Error
input:
10 1 1 1 1 1 1 1 1 1 1 1 2 4 3 5 7 8 1 4 0 1 6 0 0 1 9 1 10 0 1 1
output:
result:
Subtask #4:
score: 0
Runtime Error
Test #103:
score: 0
Runtime Error
input:
10 1 1 1 1 1 1 1 1 1 1 1 2 4 3 5 7 8 1 4 0 1 6 0 0 1 9 1 10 0 1 1
output:
result:
Subtask #5:
score: 0
Skipped
Dependency #4:
0%
Subtask #6:
score: 0
Skipped
Dependency #1:
0%