# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
259610 | dvdg6566 | Secret Permutation (RMI19_permutation) | C++14 | 42 ms | 384 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 "permutation.h"
#include<bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
const int MAXN = 300;
#define pb push_back
#define SZ(x) (int)x.size()
int firsts[MAXN];
int mids[MAXN];
int K;
int R[MAXN];
int find_diff(int pivot,int a,int b){
vi V;
V.pb(a);V.pb(b);V.pb(pivot);
for(int i=1;i<=K;++i){
if(i!=a&&i!=b&&i!=pivot)V.pb(i);
}
int k=query(V);
V.clear();
V.pb(b);V.pb(a);V.pb(pivot);
for(int i=1;i<=K;++i){
if(i!=a&&i!=b&&i!=pivot)V.pb(i);
}
int p=query(V);
return k-p;
}
void solve(int N) {
K=N;
for(int i=1;i+2<=N;++i){
firsts[i]=find_diff(i,i+1,i+2);
// cerr<<"F "<<i<<' '<<firsts[i]<<'\n';
}
for(int i=2;i+1<=N;++i){
mids[i]=find_diff(i,i-1,i+1);
// cerr<<"M "<<i<<' '<<mids[i]<<'\n';
}
vi ans;
for(int i=1;i<=N;++i)for(int j=1;j<=N;++j){
if(i==j)continue;
ans.clear();
ans.pb(i);
ans.pb(j);
bool fail=0;
while(SZ(ans)<N){
// cerr<<"Length "<<SZ(ans)<<'\n';
int lastdif=abs(ans[SZ(ans)-1] - ans[SZ(ans)-2]);
// cerr<<lastdif<<'\n';
int otdiff=abs(firsts[SZ(ans)-1]+lastdif);
// cout<<otdiff<<'\n';
int stdiff=abs(mids[SZ(ans)]+lastdif);
// cout<<stdiff<<'\n';
int a=ans[SZ(ans)-2];
int b=ans[SZ(ans)-1];
if(otdiff == stdiff+lastdif){
if(a>b)ans.pb(a-otdiff);
else ans.pb(a+otdiff);
}else if(stdiff == otdiff+lastdif){
// closer to first one
if(a>b)ans.pb(a+otdiff);
else ans.pb(a-otdiff);
}else if(otdiff + stdiff == lastdif){
if(a>b)ans.pb(a-otdiff);
else ans.pb(a+otdiff);
}else{
fail=1;break;
}
}
for(auto i:ans)if(i>N||i<1)fail=1;
if(!fail){
memset(R,0,sizeof(R));
for(auto i:ans){
if(R[i])fail=1;
R[i]=1;
}
}
// cerr<<fail<<'\n';
if(fail==0){answer(ans);return;}
}
answer(ans);
}
Compilation message (stderr)
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