# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
952233 | arbuzick | Ancient Machine 2 (JOI23_ancient2) | C++17 | 336 ms | 1272 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "ancient2.h"
#include <bits/stdc++.h>
using namespace std;
bitset<1001> bs[1000];
bool is_answer(int pos, int n) {
for (int i = 0; i < pos; ++i) {
for (int j = 0; j < n; ++j) {
if (bs[i][j]) {
if (bs[pos][j]) {
bs[pos] ^= bs[i];
}
break;
}
}
}
for (int j = 0; j < n; ++j) {
if (bs[pos][j]) {
for (int i = 0; i < pos; ++i) {
if (bs[i][j]) {
bs[i] ^= bs[pos];
}
}
return true;
}
}
return false;
}
string get_answer(int n) {
string ans = "";
for (int i = 0; i < n; ++i) {
int pos = -1;
for (int j = i; j < n; ++j) {
if (bs[j][i]) {
pos = j;
break;
}
}
swap(bs[i], bs[pos]);
for (int j = 0; j < n; ++j) {
if (j != i && bs[j][i]) {
bs[j] ^= bs[i];
}
}
}
for (int i = 0; i < n; ++i) {
ans += '0' + bs[i][n];
}
return ans;
}
string Solve(int n) {
for (int i = 0; i < 100; ++i) {
bs[i][i] = 1;
}
for (int i = 0; i < 101; ++i) {
bs[100 + i][n - i - 1] = 1;
}
vector<pair<int, int>> qs;
for (int a = 0; a < n; ++a) {
for (int b = 1; b <= n; ++b) {
if (a < b && b * 2 <= 102) {
for (int i = 0; i < n; ++i) {
if (i >= a && i % b == a % b) {
bs[201 + qs.size()][i] = 1;
} else {
bs[201 + qs.size()][i] = 0;
}
}
if (is_answer(201 + qs.size(), n)) {
qs.emplace_back(a, b);
}
}
if (qs.size() == n - 201) {
break;
}
}
if (qs.size() == n - 201) {
break;
}
}
// cout << "{";
// for (int i = 0; i < n; ++i) {
// cout << "{" << qs[i].first << ", " << qs[i].second << "}";
// if (i + 1 < n) {
// cout << ", ";
// }
// }
// cout << "}";
if (qs.size() != n - 201) {
return "";
}
for (int i = 0; i < 100; ++i) {
for (int j = 0; j < n; ++j) {
if (j == i) {
bs[i][j] = 1;
} else {
bs[i][j] = 0;
}
}
}
for (int i = 0; i < 101; ++i) {
for (int j = 0; j < n; ++j) {
if (j == n - i - 1) {
bs[100 + i][j] = 1;
} else {
bs[100 + i][j] = 0;
}
}
}
for (int i = 0; i < (int)qs.size(); ++i) {
for (int j = 0; j < n; ++j) {
if (j >= qs[i].first && j % qs[i].second == qs[i].first % qs[i].second) {
bs[201 + i][j] = 1;
} else {
bs[201 + i][j] = 0;
}
}
}
for (int i = 0; i < 100; ++i) {
vector<int> a(i + 3), b(i + 3);
for (int j = 0; j < i; ++j) {
a[j] = j + 1;
b[j] = j + 1;
}
a[i] = i + 1;
b[i] = i + 2;
a[i + 1] = b[i + 1] = i + 1;
a[i + 2] = b[i + 2] = i + 2;
int val = Query(i + 3, a, b);
if (val == i + 1) {
bs[i][n] = 0;
} else {
bs[i][n] = 1;
}
}
string suff = "";
for (int i = 0; i < 101; ++i) {
suff = "0" + suff;
vector<int> a(i + 2), b(i + 2);
for (int j = 0; j <= i + 1; ++j) {
string nw = suff.substr(0, j);
string nw0 = nw + '0';
string nw1 = nw + '1';
for (int k = 0; k <= j + 1 && k <= i + 1; ++k) {
if (nw0.substr((int)nw0.size() - k) == suff.substr(0, k)) {
a[j] = k;
}
if (nw1.substr((int)nw1.size() - k) == suff.substr(0, k)) {
b[j] = k;
}
}
}
if (Query(i + 2, a, b) == i + 1) {
bs[100 + i][n] = 0;
} else {
bs[100 + i][n] = 1;
suff = suff.substr(1);
suff = "1" + suff;
}
}
for (int i = 0; i < (int)qs.size(); ++i) {
vector<int> a(qs[i].second * 2), b(qs[i].second * 2);
for (int j = 0; j < qs[i].second; ++j) {
if (j + 1 == qs[i].second) {
a[j] = b[j] = 0;
a[qs[i].second + j] = b[qs[i].second + j] = qs[i].second;
} else {
a[j] = b[j] = j + 1;
a[qs[i].second + j] = b[qs[i].second + j] = qs[i].second + j + 1;
}
}
b[qs[i].first] += qs[i].second;
b[qs[i].first + qs[i].second] -= qs[i].second;
int val = Query(qs[i].second * 2, a, b);
if (val < qs[i].second) {
bs[201 + i][n] = 0;
} else {
bs[201 + i][n] = 1;
}
}
return get_answer(n);
}
Compilation message (stderr)
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