#pragma GCC optimize ("O3")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
int prob = 500;
#include "communication.h"
struct intervalset
{
int sz = 0;
vector<pair<int, int>>S;//sorted, disjoint
intervalset()
{
}
intervalset(int N)
{
sz = N;
S.push_back({1, N});
}
void append(pair<int, int> v)
{
sz += v.second - v.first + 1;
if (S.empty())
S.push_back(v);
else {
if (v.first > S.back().second)
{
if (v.first == S.back().second + 1)
S.back().second = v.second;
else
S.push_back(v);
}
else
{
assert(v.first >= S.back().first);
if (v.second > S.back().second) {
sz -= S.back().second - v.first + 1;
S.back().second = v.second;
}
}
}
}
pair<intervalset, intervalset> split(int k)
{ //k,sz-k
intervalset A;
intervalset B;
for (pair<int, int>i : S)
{
if (i.second - i.first + 1 <= k)
{
A.append(i);
k -= i.second - i.first + 1;
}
else if (k <= 0)
{
B.append(i);
}
else
{
A.append({i.first, i.first + k - 1});
B.append({i.first + k, i.second});
k = 0;
}
}
return {A, B};
}
int kth(int k)
{
for (pair<int, int>i : S)
{
if (i.second - i.first + 1 < k)
{
k -= i.second - i.first + 1;
}
else
{
return i.first + (k - 1);
}
}
assert(false);
return 0;
}
int kelintas(int x)
{
int r = 0;
for (pair<int, int>i : S)
{
if (i.second < x)
r += (i.second - i.first + 1);
else if (x < i.first)
return 0;
else
return r + (x - i.first + 1);
}
return 0;
}
intervalset(const intervalset &A, const intervalset &B)
{
const vector<pair<int, int>>&a = A.S;
const vector<pair<int, int>>&b = B.S;
int i = 0;
int j = 0;
while (i < (int)a.size() && j < (int)b.size())
{
if (a[i].first < b[j].first)
append(a[i++]);
else
append(b[j++]);
}
while (i < (int)a.size())
append(a[i++]);
while (j < (int)b.size())
append(b[j++]);
}
};
const int mxsum = 300;
pair<int, pair<int, int>> K[mxsum][mxsum];
bool prec = false;
map<pair<int, int>, pair<int, pair<int, int>>>M;
pair<int, pair<int, int>> getbest(int A, int B)
{
if (A + B < mxsum)
{
if (prec == false)
{
prec = true;
for (int sum = 0; sum < mxsum; sum++)
for (int a = 0; a <= sum; a++)
{
int b = sum - a;
K[a][b] = {1000, {0, 0}};
}
for (int sum = 0; sum < mxsum; sum++)
{
if (sum <= 2)
{
for (int a = 0; a <= sum; a++) {
int b = sum - a;
K[a][b] = {0, {0, 0}};
}
}
else {
bool rep = true;
while (rep)
{
rep = false;
for (int a = 0; a <= sum; a++)
{
int b = sum - a;
for (int a0 = 0; a0 <= a; a0++)
{
for (int b0 = 0; b0 <= b; b0++)
{
int a1 = a - a0;
int b1 = b - b0;
int a_ = a0 + b0;
int b_ = a1;
int a__ = a1 + b1;
int b__ = a0;
int g = 1 + max(K[a_][b_].first, K[a__][b__].first);
if (K[a][b].first > g)
{
K[a][b] = {g, {a0, b0}};
rep = true;
}
}
}
}
}
}
}
}
return K[A][B];
}
else
{
if (M.count({A, B}))
return M[ {A, B}];
pair<int, pair<int, int>> &bst = M[ {A, B}];
bst = {1000, {0, 0}};
auto check = [&](int a0, int b0)
{
if (a0 < 0 || a0 > A || b0 < 0 || b0 > B)
return;
int b1 = B - b0;
int a1 = A - a0;
int a_ = a0 + b0;
int b_ = a1;
int a__ = a1 + b1;
int b__ = a0;
int g = 1 + max(getbest(a_, b_).first, getbest(a__, b__).first);
if (bst.first > g)
bst = {g, {a0, b0}};
};
for (int da = 0; da <= 1; da++)
{
for (int db = 0; db <= da; db++)
for (int wa : { -1, 1})
for (int wb : { -1, 1})
check(A / 2 + wa * da, B / 2 + wb * db);
}
return bst;
}
}
vector<pair<int, int>>eil;
void encode(int N, int X)
{
intervalset A(N);
intervalset B;
mt19937 rng(0);
while (A.sz + B.sz > 2)
{
eil.push_back({A.sz, B.sz});
pair<int, int>c = getbest(A.sz, B.sz).second;
int a0 = c.first;
int b0 = c.second;
eil.push_back({a0, b0});
eil.push_back({0, 0});
intervalset C(A, B);
int ka = A.kelintas(X);
int kb = B.kelintas(X);
int s = 1;
if (ka != 0 && ka <= a0)
s = 0;
if (kb != 0 && kb <= b0)
s = 0;
pair<intervalset, intervalset>A_ = A.split(a0);
pair<intervalset, intervalset>B_ = B.split(b0);
int r = send(s);
if (r == 0)
{
A = intervalset(A_.first, B_.first);
B = A_.second;
}
else
{
A = intervalset(A_.second, B_.second);
B = A_.first;
}
}
}
pair<int, int> decode(int N)
{
intervalset A(N);
intervalset B;
mt19937 rng(0);
while (A.sz + B.sz > 2)
{
pair<int, int>c = getbest(A.sz, B.sz).second;
int a0 = c.first;
int b0 = c.second;
pair<intervalset, intervalset>A_ = A.split(a0);
pair<intervalset, intervalset>B_ = B.split(b0);
int r = receive();
if (r == 0)
{
A = intervalset(A_.first, B_.first);
B = A_.second;
}
else
{
A = intervalset(A_.second, B_.second);
B = A_.first;
}
}
if (A.sz == 0)
return {B.S[0].first, B.S.back().second};
if (B.sz == 0)
return {A.S[0].first, A.S.back().second};
return {A.S[0].first, B.S[0].first};
}
// int main()
// {
// int mx = 0;
// vector<pair<int, int>>ilg;
// for (int test = 0; test < 100; test++)
// {
// int N = 3 + asdasdasdasdasd() % ((int)1e9 - 3 + 1);
// int X = (asdasdasdasdasd() % N) + 1;
// encode(N, X);
// pair<int, int>a = decode(N);
// assert(a.first >= 1 && a.first <= N && a.second >= 1 && a.second <= N);
// assert(a.first == X || a.second == X);
// if (kiekis > mx)
// {
// ilg = eil;
// mx = kiekis;
// }
// if (test % 10 == 0)
// cout << kiekis << endl;
// kiekis = 0;
// eil.clear();
// }
// }
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1791 ms |
3836 KB |
Output is correct |
| 2 |
Correct |
1812 ms |
3832 KB |
Output is correct |
| 3 |
Correct |
1878 ms |
3840 KB |
Output is correct |
| 4 |
Correct |
1700 ms |
3876 KB |
Output is correct |
| 5 |
Correct |
1762 ms |
3836 KB |
Output is correct |
| 6 |
Correct |
3768 ms |
6076 KB |
Output is correct |
| 7 |
Correct |
1770 ms |
3888 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Memory limit exceeded |
7756 ms |
118784 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
