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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#644061 | #8577. 평균 최대화 | user10086 | 0 | 0ms | 0kb | C++23 | 8.0kb | 2024-10-16 10:34:49 | 2024-10-16 10:34:50 |
answer
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N = 3e5 + 10;
int n, idx, l[N], r[N], a[N], s[N], rx[N], rs[N];
// #define __int128 int
struct F
{
__int128 i, j;
F()
{
i = j = 0;
}
F(__int128 a, __int128 b)
{
__int128 d = __gcd(a, b);
i = a / d, j = b / d;
}
bool operator> (const F& f2) const
{
return i * f2.j > j * f2.i;
}
bool operator< (const F& f2) const
{
return i * f2.j < j * f2.i;
}
F operator + (const F& f2) const
{
__int128 a = i * f2.j + j * f2.i, b = j * f2.j;
return {a, b};
}
void reduce()
{
auto d = __gcd(i, j);
i /= d, j /= d;
}
}ans[N];
int pc;
mt19937 rng(20241015);
namespace Tree
{
const int R = 40;
int idx;
int ls[N * R], rs[N * R], sz[N * R];
F tass[N * R];
F val[N * R], sum[N * R];
void init()
{
val[0] = sum[0] = {0, 1};
}
int newnode(F v)
{
idx++;
assert(idx < N * R);
ls[idx] = rs[idx] = 0, sz[idx] = 1, tass[idx] = {0, 1};
val[idx] = sum[idx] = v;
return idx;
}
inline void pushup(int u)
{
if (!u) return;
pc++;
sum[u] = sum[ls[u]] + val[u] + sum[rs[u]];
sz[u] = sz[ls[u]] + 1 + sz[rs[u]];
}
inline void apply(int u, const F& dass)
{
if (!u) return;
sum[u] = {dass.i * sz[u], dass.j}, val[u] = dass;
tass[u] = dass;
}
inline void pushdown(int u)
{
if (!u) return;
if (tass[u].i == 0) return;
pc++;
apply(ls[u], tass[u]), apply(rs[u], tass[u]);
tass[u] = {0, 1};
}
array<int, 2> splitr(int u, int k)
{
// [1, k], [k+1, inf)
// printf("splitr(%lld, %lld)\n", u, k);
if (!u) return {0, 0};
pushdown(u);
if (sz[ls[u]] >= k)
{
auto res = splitr(ls[u], k);
ls[u] = res[1];
pushup(u);
return {res[0], u};
}
else
{
auto res = splitr(rs[u], k - sz[ls[u]] - 1);
rs[u] = res[0];
pushup(u);
// printf("&&&");
return {u, res[1]};
}
}
array<int, 2> splitv(int u, const F& v)
{
// [1, v] [v, inf)
if (!u) return {0, 0};
pushdown(u);
if (v > val[u])
{
auto res = splitv(ls[u], v);
ls[u] = res[1];
pushup(u);
return {res[0], u};
}
else
{
auto res = splitv(rs[u], v);
rs[u] = res[0];
pushup(u);
return {u, res[1]};
}
}
int merge(int l, int r)
{
// printf("merge(%lld, %lld)\n", l, r);
if (!l) swap(l, r);
if (!r) return l;
pushdown(l), pushdown(r);
if (rng() % (sz[l] + sz[r]) < sz[l])
{
rs[l] = merge(rs[l], r);
pushup(l);
return l;
}
else
{
ls[r] = merge(l, ls[r]);
pushup(r);
return r;
}
}
inline void insert(int& rt, const F& v)
{
auto res = splitv(rt, v);
int c = newnode(v);
rt = merge(merge(res[0], c), res[1]);
}
inline void assign(int& rt, int pos, const F& v)
{
auto res = splitr(rt, pos);
apply(res[0], v);
rt = merge(res[0], res[1]);
}
inline F qsum(int rt, int pos)
{
if (!rt) return {0, 1};
pushdown(rt);
if (pos <= sz[ls[rt]]) return qsum(ls[rt], pos);
else return sum[ls[rt]] + val[rt] + qsum(rs[rt], pos - sz[ls[rt]] - 1);
// auto res = splitr(rt, pos);
// printf("qsum(%lld, %lld)\n", rt, pos);
// F ret = sum[res[0]];
// rt = merge(res[0], res[1]);
// return ret;
}
F kth(int &rt, int k)
{
int p = sz[ls[rt]];
pushdown(rt);
if (k <= p) return kth(ls[rt], k);
else if (k > p + 1) return kth(rs[rt], k - sz[ls[rt]] - 1);
else return val[rt];
// auto res = splitr(rt, k);
// auto res2 = splitr(res[0], k - 1);
// F ret = val[res2[1]];
// rt = merge(merge(res2[0], res2[1]), res[1]);
// return ret;
}
void print(int rt)
{
if (!rt) return;
print(ls[rt]), printf("node %lld: sum = %lld/%lld, val = %lld/%lld, tass = %lld/%lld, ls = %lld, rs = %lld\n", rt, sum[rt].i, sum[rt].j, val[rt].i, val[rt].j, tass[rt].i, tass[rt].j, ls[rt], rs[rt]), print(rs[rt]);
}
}
// int pc;
int dp[N];
vector<int> son[N];
vector<int> rg[N];
map<array<int, 2>, int> mp;
int build(int l, int r)
{
idx++, ::l[idx] = l, ::r[idx] = r, mp[{l, r}] = idx;
int x = idx; rx[x] = r - l + 1, rs[x] = s[r] - s[l - 1];
for (int i = l; i <= r; i++)
{
if (rg[i].empty()) continue;
int j = rg[i].back(); rg[i].pop_back();
int y = build(i, j);
son[x].push_back(y);
rx[x] -= (j - i + 1), rs[x] -= (s[j] - s[i - 1]);
i = j;
}
return x;
}
template<class T>
void chkmax(T &x, T y)
{
if (y > x) x = y;
}
int merge(int a, int b)
{
if (!a) swap(a, b);
if (!b) return a;
// printf("merge(%lld, %lld)\n", a, b);
if (Tree::sz[a] > Tree::sz[b]) swap(a, b);
Tree::pushdown(a);
F v = Tree::val[a];
auto res = Tree::splitv(b, v);
Tree::ls[a] = merge(Tree::ls[a], res[0]), Tree::rs[a] = merge(Tree::rs[a], res[1]);
Tree::pushup(a);
return a;
}
pair<int, F> getp(int& rt, int a, int b)
{
// max (y - b) / (x - a)
int l = 0, r = Tree::sz[rt];
auto getres = [&](int x)
{
F y1 = Tree::qsum(rt, x);
y1.i -= b * y1.j, y1.j *= (x - a);
// y1.reduce();
return y1;
};
while (l < r)
{
// int mid1 = (l + r) >> 1, mid2 = mid1 + 1;
int mid = (l + r) >> 1;
F f = Tree::qsum(rt, mid), d = Tree::kth(rt, mid + 1);
f.i -= b * f.j, f.j *= (mid - a);
if (f > d) r = mid;
else l = mid + 1;
}
// printf(")))"), Tree::print(rt);
// printf("res(l) = (%lld, %lld/%lld), res(r) = (%lld, %lld/%lld)\n", l, getres(l).i, getres(l).j, r, getres(r).i, getres(r).j);
pc++;
auto resl = getres(l);
return {l, resl};
}
void dfs(int x)
{
// printf("dfs(%lld)\n", x);
dp[x] = 0;
if (son[x].empty()) for (int i = 1; i <= rx[x]; i++) Tree::insert(dp[x], {rs[x], rx[x]});
else
{
for (int y : son[x]) dfs(y), dp[x] = merge(dp[x], dp[y]);
// Tree::print(dp[x]);
// (-rx[x], -rs[x])
auto res = getp(dp[x], -rx[x], -rs[x]);
// printf("proc: res = {%lld, %lld/%lld}\n", res.first, res.second.i, res.second.j);
int p = res.first;
F v = res.second;
Tree::assign(dp[x], p, v);
for (int i = 1; i <= rx[x]; i++) Tree::insert(dp[x], v);
}
// Tree::print(dp[x]);
// cout << "***";
auto res = getp(dp[x], -2, -(a[l[x] - 1] + a[r[x] + 1]));
ans[x] = res.second;
// printf("%lld: (%lld, %lld/%lld)\n", x, res.first, ans[x].i, ans[x].j);
}
void initialize(vector<signed> A)
{
n = (int)(A.size());
for (int i = 1; i <= n; i++) a[i] = A[i - 1];
for (int i = 1; i <= n; i++) s[i] = a[i] + s[i - 1];
vector<int> s;
for (int i = n; i >= 1; i--)
{
while (!s.empty() && a[s.back()] > a[i])
{
int x = s.back(); s.pop_back();
if (x != i + 1) rg[i + 1].push_back(x - 1);
}
if (!s.empty() && s.back() != i + 1) rg[i + 1].push_back(s.back() - 1);
if (!s.empty() && a[s.back()] >= a[i]) s.pop_back();
s.push_back(i);
}
// for (int i = 1; i <= n; i++)
// for (int j : rg[i]) printf("[%lld, %lld]\n", i, j);
build(2, n - 1);
// for (int i = 1; i <= n; i++)
// printf("rx[%lld] = %lld, rs[%lld] = %lld\n", i, rx[i], i, rs[i]);
Tree::init();
dfs(1);
// for (int i = 1; i <= n; i++)
// for (int j = 0; j <= sz[i]; j++)
// printf("dp[%lld][%lld] = %lld\n", i, j, dp[i][j]);
// for (int i = 1; i <= n; i++)
// for (int j : son[i]) printf("[%lld, %lld] -> [%lld, %lld]\n", l[i], r[i], l[j], r[j]);
}
array<long long, 2> maximum_average(signed i, signed j)
{
i++, j++;
if (j == i + 1) return {a[i] + a[j], 2};
assert(mp.find({i + 1, j - 1}) != mp.end());
int id = mp[{i + 1, j - 1}];
return {ans[id].i, ans[id].j};
}
//signed main()
//{
// cin.tie(0)->sync_with_stdio(0);
//
// int n; cin >> n;
// vector<signed> A;
// for (int i = 1, ai; i <= n; i++) cin >> ai, A.push_back(ai);
//// for (int i = 1, ai; i <= n; i++) A.push_back(rng() % 10000000 + 1);
// initialize(A);
// printf("idx = %lld, pc = %lld, time = %lld\n", idx, pc, (int)clock());
// int l, r;
// while (cin >> l >> r)
// {
// auto res = maximum_average(l, r);
// cout << res[0] << ' ' << res[1] << '\n';
// }
//}
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:
10 2 4 3 9 9 9 9 9 9 1 2 0 2 0 9
output:
9 3 60 9
result:
Subtask #2:
score: 0
Skipped
Dependency #1:
0%
Subtask #3:
score: 0
Skipped
Dependency #2:
0%
Subtask #4:
score: 0
Memory Limit Exceeded
Test #15:
score: 0
Memory Limit Exceeded
input:
300000 1 2 4 4 4 4 3 2 4 4 3 4 4 4 4 4 4 4 4 4 3 4 3 4 4 4 4 4 4 4 4 3 3 4 4 4 3 4 3 4 4 4 4 4 4 4 4 4 4 3 3 4 4 4 3 4 4 3 4 4 4 4 4 4 4 3 2 4 4 4 4 4 4 4 4 4 4 4 4 4 3 4 4 4 4 4 4 4 4 4 4 4 2 4 4 2 4 4 3 4 4 4 2 3 4 4 4 4 4 4 3 2 4 4 4 2 4 4 4 4 4 4 4 4 4 4 4 2 4 4 4 4 4 4 3 4 4 3 4 4 4 4 4 4 4 4 4...
output:
1041675 278497 23 7 3 2 8 2 6 2 8 2 8 2 7 2 5 2 21 6 224 60 8 2 6 2 7 2 42 11 13 4 8 2 7 2 8 2 8 2 8 2 8 2 8 2 8 2 8 2 7 2 10 3 7 2 7 2 38 10 8 2 7 2 8 2 8 2 8 2 8 2 8 2 8 2 7 2 6 2 18 5 8 2 7 2 8 2 7 2 10 3 7 2 7 2 46 12 8 2 7 2 8 2 8 2 8 2 8 2 8 2 8 2 8 2 8 2 7 2 6 2 18 5 8 2 7 2 8 2 7 2 14 4 8 2 ...
result:
Subtask #5:
score: 0
Skipped
Dependency #3:
0%
Subtask #6:
score: 0
Memory Limit Exceeded
Test #28:
score: 0
Memory Limit Exceeded
input:
300000 1 300000 300001 299999 300003 299998 300005 299997 300007 299996 300009 299995 300011 299994 300013 299993 300015 299992 300017 299991 300019 299990 300021 299989 300023 299988 300025 299987 300027 299986 300029 299985 300031 299984 300033 299983 300035 299982 300037 299981 300039 299980 3000...
output:
917250302 2450
result:
Subtask #7:
score: 0
Skipped
Dependency #4:
0%
Subtask #8:
score: 0
Skipped
Dependency #1:
0%