| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 197306 | Pankin | Hidden Sequence (info1cup18_hidden) | C++14 | 0 ms | 0 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<bits/stdc++.h>
#include "grader.h"
using namespace std;
/*
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("-O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
*/
#define mp make_pair
#define ll long long
#define ld long double
#define pb push_back
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fs first
#define sc second
#define getfiles ifstream cin("input.txt"); ofstream cout("output.txt");
#define endl '\n'
#define pii pair<int, int>
const int INF = 2000000005;
const ll BIG_INF = 2000000000000000005;
const int mod = 1000000007;
const int P = 31;
const ld PI = 3.141592653589793238462643;
const double eps = 1e-9;
using namespace std;
using namespace __gnu_pbds;
bool valid(int x, int y, int n, int m) {
return x >= 0 && y >= 0 && x < n && y < m;
}
mt19937 rng(1999999973);
map<int, bool> fin;
inline pii getBlock(int num, vector<int> &ans) {
int cur = 0, l;
for (int i = 0; ; i++) {
if (i == ans.size())
return mp(-1, -1);
if (i != 0 && ans[i] != ans[i - 1])
cur++;
if (cur == num) {
l = i;
break;
}
}
int r = l;
while(r + 1 < ans.size() && ans[r + 1] == ans[l])
r++;
return mp(l, r);
}
inline void doBlock(int i, vector<int> &ans, int &ad, int &n, int l, int r) {
int cursize = getBlock(i, ans).sc - getBlock(i, ans).fs + 1;
vector<int> cur;
int curBlock = 0;
cur.pb(ans[0]);
if (i != 0) {
cur.pop_back();
curBlock++;
cur.pb(ans[getBlock(1, ans).fs]);
}
while(curBlock != i) {
pii otr = getBlock(curBlock, ans);
if (curBlock + 2 <= i && otr.fs == otr.sc) {
cur.pb(ans[otr.fs]);
curBlock += 2;
continue;
}
else {
cur.pb(ans[otr.sc + 1]);
curBlock++;
continue;
}
}
int val = ans[getBlock(curBlock, ans).fs];
for (int i = 0; i < cursize; i++)
cur.pb(val);
curBlock++;
if (getBlock(curBlock, ans) != mp(-1, -1))
cur.pb(val ^ 1);
while(getBlock(curBlock + 1, ans) != mp(-1, -1)) {
pii otr = getBlock(curBlock, ans);
if (getBlock(curBlock + 2, ans) != mp(-1, -1) && otr.fs == otr.sc) {
cur.pb(ans[otr.fs]);
curBlock += 2;
continue;
}
else {
cur.pb(ans[otr.sc + 1]);
curBlock++;
continue;
}
}
if (cur.size() > n / 2 + 1) {
return;
}
if (!isSubsequence(cur)) {
fin[i] = true;
return;
}
ans.insert(ans.begin() + l, ans[r]);
ad++;
doBlock(i, ans, ad, n, l, r + 1);
}
vector<int> findSequence(int n) {
int sw = 0, col = -1;
for (int i = 0; i <= n / 2 + 1; i++) {
vector<int> seq;
for (int j = 0; j < i; j++)
seq.pb(0);
if (!isSubsequence(seq)) {
col = i - 1;
break;
}
}
if (col == -1) {
sw = 1;
for (int i = 0; i <= n / 2 + 1; i++) {
vector<int> seq;
for (int j = 0; j < i; j++)
seq.pb(1);
if (!isSubsequence(seq)) {
col = i - 1;
break;
}
}
}
vector<int> ans, cur;
for (int i = 0; i < col; i++)
ans.pb(sw);
cur = ans;
int ad = 0;
for (int i = 0; i <= col; i++) {
cur.insert(cur.begin() + i, 1 ^ sw);
if (isSubsequence(cur)) {
ans.insert(ans.begin() + i + ad, 1 ^ sw);
ad++;
}
cur.erase(cur.begin() + i);
}
cur.clear();
for (int i = 0; getBlock(i, ans) != mp(-1, -1); i++) {
pii co = getBlock(i, ans);
int l = co.fs, r = co.sc;
if (ans[l] == 0)
continue;
doBlock(i, ans, ad, n, l, r);
}
for (int i = 0; getBlock(i, ans) != mp(-1, -1); i++) {
pii co = getBlock(i, ans);
int l = co.fs, r = co.sc;
if (ans[l] == 0)
continue;
if (fin[i])
continue;
for (int j = 0; j < n - col - ad; j++)
ans.insert(ans.begin() + l, 1);
break;
}
return ans;
}