Submission #199601

#	Time	Username	Problem	Language	Result	Execution time	Memory
199601		zaneyu	Combo (IOI18_combo)	C++14	100 / 100	53 ms	576 KiB

combo

#include<combo.h>
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<long long, null_type, less_equal<long long>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
#pragma GCC optimize("unroll-loops,no-stack-protector")
//order_of_key #of elements less than x
// find_by_order kth element
typedef long long int ll;
#define ld double
#define pii pair<ll,ll>
#define f first
#define s second
#define pb push_back
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define FILL(n,x) memset(n,x,sizeof(n))
#define ALL(_a) _a.begin(),_a.end()
#define sz(x) (int)x.size()
const ll maxn=1e5+5;
const ll maxlg=__lg(maxn)+2;
const ll INF64=4e18;
const int INF=0x3f3f3f3f;
const ll MOD=998244353;
const ld PI=acos(-1);
const ld eps=1e-9;
#define lowb(x) x&(-x)
#define MNTO(x,y) x=min(x,(__typeof__(x))y)
#define MXTO(x,y) x=max(x,(__typeof__(x))y)
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
#define GET_POS(c,x) (lower_bound(c.begin(),c.end(),x)-c.begin())
ll mult(ll a,ll b){
    return (a*b)%MOD;
}
ll mypow(ll a,ll b){
    if(b<=0) return 1;
    ll res=1LL;
    while(b){
        if(b&1) res=mult(res,a);
        a=mult(a,a);
        b>>=1;
    }
    return res;
}  
string guess_sequence(int n){
  string ans="";
  int pv=0;
  char a,b,c,d;
  if(press("AB")){
    a='A',b='B',c='X',d='Y';
    if(press("B")) swap(a,b);
  }
  else{
    a='X',b='Y',c='A',d='B';
    if(press("Y")) swap(a,b);
  }
  ans+=a;
  if(n==1) return ans;
  REP(i,n-2){
    int z=press(ans+b+ans+c+b+ans+c+c+ans+c+d);
    if(z==i+1) ans+=d;
    else if(z==i+2) ans+=b;
    else ans+=c;
  }
  if(press(ans+b)==n) ans+=b;
  else if(press(ans+c)==n) ans+=c;
  else ans+=d;
  return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:49:7: warning: unused variable 'pv' [-Wunused-variable]
   49 |   int pv=0;
      |       ^~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95