#include "shuffle.h"
#include <bits/stdc++.h>
//#define int ll
using namespace std;
#define ll long long
#define f first
#define s second
#define pii pair<int, int>
#define MX(a,b) a=max(a,b)
#define MN(a,b) a=min(a,b)
#define SZ(x) (int)(x).size()
#define ALL(x) (x).begin(), (x).end()
#define REP(i,n) for (int i = 0; i<n; ++i)
#define REP1(i,n) for (int i = 1; i<=n; ++i)
#define pb push_back
#ifdef BALBIT
#define bug(...) cerr<<"#"<<__LINE__<<": "<<#__VA_ARGS__<<"- ", _do(__VA_ARGS__)
template<typename T> void _do( T && x) {cerr<<x<<endl;}
template<typename T, typename ...S> void _do( T && x, S && ...y) {cerr<<x<<", "; _do(y...);}
#else
#define bug(...)
#define endl '\n'
#endif // BALBIT
const int maxn = 3e5+5;
#define VI vector<int>
#ifdef BALBIT
vector<int> per = {6,4,3,2,1,5};
std::vector< std::vector<int> > shuffle(std::vector< std::vector<int> > x){
REP(i, SZ(x)) {
for (int &y:x[i]) {
y = per[y-1];
}
random_shuffle(ALL(x[i]));
}
return x;
// REP(i, SZ(x)) {
// for (int y : x[i]) cout<<y<<' ';
// cout<<endl;
// }
// cout<<endl;
// bug("enter!");
// vector<vector<int> > re(SZ(x), vector<int> (SZ(x[0])));
// REP(i, SZ(x)) REP(j, SZ(x[0])) cin>>x[i][j];
// return re;
}
#endif // BALBIT
vector<vector<int> > myshuffle(vector<vector<int> > b) {
for (auto &y : b) for (int &x : y) ++x;
vector<vector<int> > gt = shuffle(b);
for (auto &y : gt) for(int &x : y) --x;
return gt;
}
vector<int> g1[maxn], g2[maxn];
bool seen[maxn];
vector<int> ord;
void dfs(int v, bool one) {
ord.pb(v); seen[v] = 1;
for (int u : (one?g1:g2)[v]) {
if (!seen[u]) {
dfs(u, one^1);
}
}
}
#define vvi vector<vector<int> >
vector<int> chg(vvi a, vvi b) {
vector<int> GP(SZ(a) * SZ(a[0]));
REP(i, SZ(a)) {
for (int x : a[i]) {
GP[x] = i;
}
}
vector<int> re;
REP(i, SZ(b)) {
for (int x : b[i]) {
if (i != GP[x]) {
re.pb(x);
}
}
}
return re;
}
vector<int> solve(int N, int B, int K, int Q, int ST) {
auto F = [&](int &at) {int oat = at; at = (at+1)%B; return oat; };
if (ST == 3) {
// shuffle solving for the case where the buckets AREN't shuffled
vector<pair<VI, VI> > v;
vector<int> strt;
REP(i,N) strt.pb(i);
v.pb({strt, strt});
// groups of {index, p[i]}
while (1) {
vector<vector<int> > ask (B);
vector<int> whichbucket(N); // which bucket is this index tossed into?
vector<int> group(N); // which group is this result from?
bool need = 0;
int AT = 0;
int grp = 0;
vector<vector<pair<VI, VI> > > yeah(SZ(v));
for (auto &e : v) {
yeah[grp].resize(B);
if (SZ(e.f) > 1) need = 1;
REP(i, SZ(e.f)) {
whichbucket[e.f[i]] = AT;
yeah[grp][AT].f.pb(e.f[i]);
ask[AT].pb(e.f[i]);
F(AT);
}
for (int x : e.s) {
group[x]=grp;
}
++grp;
}
if (need == 0) break;
vector<vector<int> > get = myshuffle(ask);
vector<pair<VI, VI> > nv;
REP(i, B) {
REP(j, K) {
yeah[group[get[i][j]]][i].s.pb(
get[i][j]);
}
}
for (auto & e : yeah) {
REP(i,B) {
if (SZ(e[i].f)) {
nv.pb(e[i]);
}
}
}
v.swap(nv);
}
vector<int> re(N);
bug(SZ(v));
assert(SZ(v) == N);
REP(i, SZ(v)) {
re[v[i].f[0]] = v[i].s[0] + 1;
}
return re;
}
if (ST == 4) {
assert(K == 2);
vector<vector<int> > ask1, ask2;
REP(i,N) {
if (i % 2 == 0) {
ask1.pb({i, i+1});
}else{
ask2.pb({i, (i+1)%N});
}
}
vector<vector<int> > gt1 = myshuffle(ask1), gt2 = myshuffle(ask2);
// build graphs
REP(i,SZ(gt1)) {
g1[gt1[i][0]].pb(gt1[i][1]);
g1[gt1[i][1]].pb(gt1[i][0]);
g2[gt2[i][0]].pb(gt2[i][1]);
g2[gt2[i][1]].pb(gt2[i][0]);
}
swap(ask1[0][0], ask1[1][0]);
vector<vector<int> > c1 = myshuffle(ask1);
swap(ask1[0][0], ask1[1][0]);
swap(ask1[0][0], ask1[2][0]);
vector<vector<int> > c2 = myshuffle(ask1);
vector<int> d1 = chg(c1, gt1);
vector<int> d2 = chg(c2, gt1);
assert(SZ(d1) == 2); assert(SZ(d2) == 2);
int one = -1;
for (int x : d1) for (int y : d2) if (x == y) one = x;
assert(one != -1);
dfs(one, 1);
for (int &x : ord) ++x;
return ord;
}
}
signed main(){
ios::sync_with_stdio(0), cin.tie(0);
bug(1,2);
vector<int> gt = solve(6,3,2,-1,4);
for(int x : gt) cout<<x<<' ';
cout<<endl;
}
Compilation message
shuffle.cpp: In function 'std::vector<int> solve(int, int, int, int, int)':
shuffle.cpp:201:1: warning: control reaches end of non-void function [-Wreturn-type]
201 | }
| ^
/usr/bin/ld: /tmp/ccKAMbN5.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc44SBj7.o:shuffle.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
