Submission #278065

#	Time	Username	Problem	Language	Result	Execution time	Memory
278065		zaneyu	Combo (IOI18_combo)	C++14	100 / 100	40 ms	608 KiB

combo

 /*input
ABXY
*/
#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<pair<int,int>, null_type, less<pair<int,int>>, 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<int,int>
#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=1e6+5;
const ll maxlg=__lg(maxn)+2;
const ll INF64=4e18;
const int INF=0x3f3f3f3f;
const ll MOD=1e9+7;
const ld PI=3.14159265358979323846;
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())
#define MP make_pair
ll mult(ll a,ll b){
    return (a*b)%MOD;
}
ll mypow(ll a,ll b){
    ll res=1LL;
    while(b){
        if(b&1) res=res*a%MOD;
        a=a*a%MOD;
        b>>=1;
    }
    return res;
}
string guess_sequence(int n) {
    string a="ABXY", b="AB", d, s;
    if(!press(b)){
        b="XY";
    }
    char f=b[0];
    string ss;
    ss.pb(b[0]);
    if(!press(ss)){
        f=b[1];
    }
    for(char c:a)
        if(c!=f)
            d+=c;
    s+=f;
    if(n==1){
        return s;
    }
    REP(i,n-2) s+=d[press(s+d[1]+s+d[2]+d[0]+s+d[2]+d[1]+s+d[2]+d[2])-sz(s)];
    REP(i,2){
        if(press(s+d[i])==n){
            return s+d[i];
        }
    }
    return s+d[2];
}

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