#include <bits/stdc++.h>
#include <chrono>
using namespace std;
using namespace std::chrono;
// #pragma GCC target ("avx2")
// #pragma GCC optimization ("O3")
// #pragma GCC optimization ("unroll-loops")
#define f0r(a, b) for (long long a = 0; a < b; a++)
#define f1r(a, b, c) for (long long a = b; a < c; a++)
#define f0rd(a, b) for (long long a = b; a >= 0; a--)
#define f1rd(a, b, c) for (long long a = b; a >= c; a--)
#define ms(arr, v) memset(arr, v, sizeof(arr))
#define pb push_back
#define io {ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);}
#define mp make_pair
#define f first
#define s second
#define presum(p, a, n) {p[0] = a[0]; for (int i = 1; i < n; i++) p[i] = a[i] + p[i-1];}
#define all(v) v.begin(), v.end()
#define readgraph(list, edges) for (int i = 0; i < edges; i++) {int a, b; cin >> a >> b; a--; b--; list[a].pb(b); list[b].pb(a);}
#define ai(a, n) for (int ele = 0; ele < n; ele++) cin >> a[ele];
#define ain(a, lb, rb) for (int ele = lb; ele <= rb; ele++) cin >> a[ele];
#define ao(a, n) {for (int ele = 0; ele < n; ele++) { if (ele) cout << " "; cout << a[ele]; } cout << '\n';}
#define aout(a, lb, rb) {for (int ele = lb; ele <= rb; ele++) { if (ele > lb) cout << " "; cout << a[ele]; } cout << '\n';}
typedef long long ll;
typedef double ld;
typedef long double lld;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;
template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";
}
// template<typename A, typename B> ll max(A x, B y) {
// return x > y ? x : y;
// }
// template<typename A, typename B> ll min(A x, B y) {
// return x < y ? x : y;
// }
mt19937 rng(steady_clock::now().time_since_epoch().count());
/* usage - just do rng() */
void usaco(string filename) {
#pragma message("be careful, freopen may be wrong")
freopen((filename + ".in").c_str(), "r", stdin);
freopen((filename + ".out").c_str(), "w", stdout);
}
const ll mod = 998244353;
ll madd(ll a, ll b) {
return (a + b) % mod;
}
ll msub(ll a, ll b) {
return (((a - b) % mod) + mod) % mod;
}
ll mmul(ll a, ll b) {
return ((a % mod) * (b % mod)) % mod;
}
ll mpow(ll base, ll exp) {
ll res = 1;
while (exp) {
if (exp % 2 == 1){
res = (res * base) % mod;
}
exp >>= 1;
base = (base * base) % mod;
}
return res;
}
ll minv(ll base) {
return mpow(base, mod - 2);
}
ll mdiv(ll a, ll b) {
return mmul(a, minv(b));
}
ll gcd(ll x, ll y) {
if (x == 0) return y;
if (y == 0) return x;
return gcd(y, x % y);
}
// bool prime[1000006];
// void sieve(int n) {
// f0r(i, n + 1) prime[i] = 1;
// for (int p = 2; p * p <= n; p++) {
// if (prime[p] == true) {
// for (int i = p * p; i <= n; i += p)
// prime[i] = false;
// }
// }
// prime[1] = prime[0] = 0;
// }
ll n, m, k, q, Q, T, l, r, x, y, z;
ll a[500005];
ll b[500005];
string s, t;
ll ans = 0;
bool pref[300];
int ret[7];
int actual[63];
// #include "game.h"
int* get_attachment(vector<int> source;) {
n = source;
pref[0] = 0;
f1r(i, 1, n+1) {
pref[i] = pref[i - 1] ^ source[i - 1];
}
pref[n + 1] = pref[n];
int sz = (n + 1) / 2;
vi locs = {0, (int)(n + 1) / 2};
int i = 0;
bool fin = 0;
while (sz) {
bool prot = 0;
for (int x: locs) {
if ((x / sz) % 2) continue;
prot ^= pref[x + sz] ^ pref[x];
}
fin ^= prot;
ret[i++] = prot;
sz /= 2;
vi o;
for (int x: locs) o.pb(x + sz);
for (int x: o) locs.pb(x);
}
ret[i] = fin;
return ret;
}
int* retrieve(vector<int> data) {
int lg = 6;
if (n == 255) lg = 8;
bool fin = data[n + lg];
bool o = 0;
f1r(i, n, n + lg) o ^= data[i];
if (o != fin) {
f0r(i, n) actual[i] = data[i];
return actual;
}
pref[0] = 0;
f1r(i, 1, n+1) {
pref[i] = pref[i - 1] ^ data[i - 1];
}
pref[n + 1] = pref[n];
int sz = (n + 1) / 2;
vi locs = {0, (int)(n + 1) / 2};
int i = 0;
int l = 0, r = n;
while (sz) {
int m = (l + r) / 2;
bool prot = 0;
for (int x: locs) {
if ((x / sz) % 2) continue;
prot ^= pref[x + sz] ^ pref[x];
}
// cout << prot << " " << data[n + lg - (i + 1)] << endl;
if (prot == data[n + lg - (++i)]) l = m + 1;
else r = m;
sz /= 2;
vi o;
for (int x: locs) o.pb(x + sz);
for (int x: o) locs.pb(x);
}
// cout << l << endl;
data[l] = !data[l];
f0r(i, n) actual[i] = data[i];
return actual;
}
// int main() {
// io;
// // freopen("case", "r", stdin);
// // freopen("test.txt", "r", stdin);
// // freopen("case", "w", stdout);
// // freopen("file.in", "r", stdin);
// // usaco("file");
// int a[7] = {1, 1, 1, 1, 0, 1, 0};
// int *x = get_attachment(a);
// // f0r(i, 4) cout << x[i] << endl;
// int b[11] = {1, 1, 1, 1, 0, 1, 0, x[0], x[1], x[2], x[3]};
// int *y= retrieve(b);
// f0r(i, 7) cout << y[i] << endl;
// }
Compilation message
transfer.cpp: In function 'void usaco(std::__cxx11::string)':
transfer.cpp:54:53: note: #pragma message: be careful, freopen may be wrong
#pragma message("be careful, freopen may be wrong")
^
transfer.cpp: At global scope:
transfer.cpp:117:39: error: expected ')' before ';' token
int* get_attachment(vector<int> source;) {
^
transfer.cpp:117:40: error: expected unqualified-id before ')' token
int* get_attachment(vector<int> source;) {
^
transfer.cpp: In function 'void usaco(std::__cxx11::string)':
transfer.cpp:55:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen((filename + ".in").c_str(), "r", stdin);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
transfer.cpp:56:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen((filename + ".out").c_str(), "w", stdout);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
