QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#642911 | #8577. 평균 최대화 | user10086 | 0 | 2255ms | 902716kb | C++17 | 7.4kb | 2024-10-15 17:00:22 | 2024-10-15 17:00:23 |
Judging History
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];
mt19937 rng(20241015);
int pc;
namespace Tree
{
const int R = 30;
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;
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}, sum[u].reduce(), val[u] = dass;
tass[u] = dass;
}
inline void pushdown(int u)
{
if (!u) return;
if (tass[u].i == 0) return;
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)
{
pc++;
// 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)
{
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)
{
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 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)
{
// printf("merge(%lld, %lld)\n", a, b);
if (Tree::sz[a] < Tree::sz[b]) swap(a, b);
if (!b) return a;
Tree::pushdown(b);
merge(a, Tree::ls[b]), Tree::insert(a, Tree::val[b]), merge(a, Tree::rs[b]);
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);
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);
auto resl = getres(l), resr = getres(r);
resl.reduce(), resr.reduce();
if (resl > resr) return {l, resl};
else return {r, resr};
}
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()
//{
// int n; cin >> n;
// vector<signed> A;
// for (int i = 1, ai; i <= n; i++) cin >> ai, A.push_back(ai);
// initialize(A);
// while (1)
// {
// int l, r; cin >> l >> r;
// auto res = maximum_average(l, r);
// cout << res[0] << ' ' << res[1] << endl;
// }
//}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 0
Wrong Answer
time: 31ms
memory: 875136kb
input:
10 2 4 3 9 9 9 9 9 9 1 2 0 2 0 9
output:
5 2 32 5
result:
wrong answer Wrong Answer on query #1: 5/2 != 9/3
Subtask #2:
score: 0
Skipped
Dependency #1:
0%
Subtask #3:
score: 0
Skipped
Dependency #2:
0%
Subtask #4:
score: 0
Wrong Answer
Test #15:
score: 0
Wrong Answer
time: 2255ms
memory: 902716kb
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:
13039281 3485800 23 7 3 2 8 2 6 2 8 2 8 2 7 2 5 2 7 2 56 15 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 3 1 7 2 7 2 19 5 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 3 1 7 2 7 2 23 6 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 7 2 8 2 7 2 7...
result:
wrong answer Wrong Answer on query #1: 13039281/3485800 != 1041675/278497
Subtask #5:
score: 0
Skipped
Dependency #3:
0%
Subtask #6:
score: 0
Time Limit Exceeded
Test #28:
score: 0
Time 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:
Unauthorized output
result:
Subtask #7:
score: 0
Skipped
Dependency #4:
0%
Subtask #8:
score: 0
Skipped
Dependency #1:
0%