QOJ.ac
QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#305265 | #5249. Bandits | LaStataleBlue | WA | 282ms | 39132kb | C++17 | 4.5kb | 2024-01-14 23:50:34 | 2024-01-14 23:50:35 |
Judging History
answer
#include <cstdio>
#include <algorithm>
#include <utility>
#include <vector>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
constexpr int MAXN = 1e5 + 5;
constexpr int MAXR = 1e9 + 5;
#define allvec(v) v.data(), v.data() + v.size()
vector<pii> g[MAXN];
namespace lca
{
int timer = 0, tin[MAXN], tout[MAXN];
ll dist[MAXN];
constexpr int LOGMAXN = 18;
int up[MAXN][LOGMAXN];
void dfs(int n, int p)
{
tin[n] = timer++;
up[n][0] = p;
for (int i = 1; i < LOGMAXN; i++)
up[n][i] = up[up[n][i - 1]][i - 1];
for (const auto &[a, w] : g[n])
if (a != p)
{
dist[a] = dist[n] + w;
dfs(a, n);
}
tout[n] = timer++;
}
void init()
{
dist[1] = 0;
dfs(1, 1);
}
bool is_ancestor(int u, int v)
{
return tin[u] <= tin[v] && tout[u] >= tout[v];
}
int lca(int u, int v)
{
if (is_ancestor(u, v))
return u;
if (is_ancestor(v, u))
return v;
for (int i = LOGMAXN - 1; i >= 0; i--)
if (!is_ancestor(up[u][i], v))
u = up[u][i];
return up[u][0];
}
ll getdist(int u, int v)
{
return dist[u] + dist[v] - 2 * dist[lca(u, v)];
}
} // namespace lca
namespace centroid
{
int treesize[MAXN];
bool used[MAXN];
pair<int, ll> up[MAXN];
void dfs(int n, int p)
{
treesize[n] = 1;
for (const auto &[a, _] : g[n])
if (a != p && !used[a])
{
dfs(a, n);
treesize[n] += treesize[a];
}
}
int centroid(int n, int p, int sz)
{
for (const auto &[a, _] : g[n])
if (a != p && !used[a] && treesize[a] > sz / 2)
return centroid(a, n, sz);
return n;
}
void decomposition(int n, int p)
{
dfs(n, n);
int c = centroid(n, n, treesize[n]);
up[c] = {p, p == -1 ? 1e15 : lca::getdist(c, p)};
used[c] = true;
for (const auto &[a, _] : g[c])
if (!used[a])
decomposition(a, c);
}
void init()
{
decomposition(1, -1);
}
} // namespace centroid
struct FenwickTree
{
vector<int> tree;
void init(int n)
{
tree.assign(n + 1, 0);
}
void update(int p, int a)
{
p++;
while (p < tree.size())
{
tree[p] += a;
p += p & (-p);
}
}
int query(int p)
{
int s = 0;
p++;
while (p > 0)
{
s += tree[p];
p -= p & (-p);
}
return s;
}
};
namespace querystuff
{
vector<int> rs[MAXN];
FenwickTree ft[MAXN];
void addquery(int cn, int radius)
{
rs[cn].push_back(radius);
}
void init(int N)
{
for (int i = 1; i <= N; i++)
if (rs[i].size() != 0)
{
vector<int> &r = rs[i];
sort(allvec(r));
int nsz = unique(allvec(r)) - r.data();
r.resize(nsz);
ft[i].init(nsz);
}
}
void update(int cn, int radius)
{
if (rs[cn].size() == 0)
return;
int l = 0, r = rs[cn].size();
while (l + 1 != r)
{
int m = (l + r) / 2;
if (rs[cn][m] <= radius)
l = m;
else
r = m;
}
ft[cn].update(l, 1);
}
int query(int cn, int a, int b) // [a, b)
{
if (rs[cn].size() == 0)
return 0;
const auto getlt = [cn](int val) -> int
{
if (rs[cn][0] >= val)
return 0;
int l = 0, r = rs[cn].size();
while (l + 1 != r)
{
int m = (l + r) / 2;
if (rs[cn][m] < val)
l = m;
else
r = m;
}
return ft[cn].query(l);
};
return getlt(b) - getlt(a);
}
}; // namespace querystuff
int main()
{
int N;
scanf("%d", &N);
vector<pii> roads(N);
for (int i = 0, u, v, w; i < N - 1; i++)
{
scanf("%d %d %d", &u, &v, &w);
g[u].push_back({v, w});
g[v].push_back({u, w});
roads[i] = {u, v};
}
lca::init();
centroid::init();
int Q;
scanf("%d", &Q);
vector<pii> queries(Q);
for (int i = 0; i < Q; i++)
{
char t[2];
int a, b = -1;
scanf("%s %d", t, &a);
if (t[0] == '+')
scanf("%d", &b);
queries[i] = {a, b};
if (t[0] == '+')
{
ll radius = b;
for (int cn = a; cn != -1 && radius > 0;)
{
const auto [u, d] = centroid::up[cn];
querystuff::addquery(cn, radius);
cn = u;
radius -= d;
}
}
}
querystuff::init(N);
for (const auto &[a, b] : queries)
if (b == -1)
{
const auto [v0, v1] = roads[a - 1];
int start = lca::is_ancestor(v0, v1) ? v1 : v0;
ll dist = 0;
int ans = 0;
for (int cn = start; cn != -1 && dist < MAXR;)
{
const auto [u, d] = centroid::up[cn];
ans += querystuff::query(cn, dist, min(ll(MAXR), dist + 2 * d));
cn = u;
dist += d;
}
printf("%d\n", ans);
}
else
{
ll radius = b;
for (int cn = a; cn != -1 && radius > 0;)
{
const auto [u, d] = centroid::up[cn];
querystuff::update(cn, radius);
cn = u;
radius -= d;
}
}
return 0;
}
详细
Test #1:
score: 0
Wrong Answer
time: 282ms
memory: 39132kb
input:
100000 2670 75097 4080 87477 75802 1712 51835 36626 2883 19412 25923 5852 23976 19312 2520 82536 19514 2492 27160 66601 4483 99087 15088 3504 47050 58820 2964 37063 5696 9901 7717 1496 4891 79136 5448 4340 22575 81285 9289 96280 3803 9877 41980 32139 2855 44236 64938 3298 5983 99947 9666 95856 62545...
output:
0 0 0 1 1 4 1 1 2 3 3 6 7 7 9 9 12 11 11 8 8 9 9 8 9 8 9 8 12 9 11 11 11 13 10 14 14 9 14 13 12 19 14 16 19 19 14 15 18 21 19 23 22 20 24 25 28 27 28 31 30 31 34 35 37 34 32 35 38 36 37 40 39 40 42 38 40 48 45 47 49 52 55 52 55 55 54 56 56 56 57 59 60 62 63 62 64 65 67 64 67 64 67 67 66 66 65 66 67 ...
result:
wrong answer 4th lines differ - expected: '2', found: '1'