Submission #737840

#	Time	Username	Problem	Language	Result	Execution time	Memory
737840		nicolaev	Combo (IOI18_combo)	C++14	30 / 100	46 ms	588 KiB

combo

#include <bits/stdc++.h>
using namespace std;
#define mod                1000000007
#define ll                 long long 
#define all(v)             v.begin(), v.end()
#define fr(n)              for(ll i=0;i<n;++i)
#define ctz(x)             __builtin_ctzll(x)
#define clz(x)             __builtin_clzll(x)
#define pcount(x)          __builtin_popcountll(x)
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
// #define cin fin
// #define cout fout
// ifstream fin
// ofstream fout
//const ll maxn = 3e5 + 5;
//int f[maxn],nf[maxn],inv[maxn];
//const int M=998244353;
//void init(){
//inv[1]=1; for (int i=2;i<maxn;i++) inv[i]=M-1ll*(M/i)*inv[M%i]%M;
//f[0]=nf[0]=1; for (int i=1;i<maxn;i++) f[i]=1ll*f[i-1]*i%M,nf[i]=1ll*nf[i-1]*inv[i]%M;
//}
//int C(int x,int y){return 1ll*f[x]*nf[y]%M*nf[x-y]%M;}


int press(string p);
string guess_sequence(int n){
    string fs="";
    // vector<string> v;
    // v.push_back("A");
    // v.push_back("B");
    // v.push_back("X");
    // v.push_back("Y");
    // for(int i=0; i<4; i++){
    //     int temp=press(v[i]);
    //     if(temp){
    //         fs+=v[i];
    //         v.erase(v.begin()+i);
    //         break;
    //     }
    // }
    string first;
    int temp=press("AB");
    if(temp){
        int temp2=press("A");
        if(temp2) first="A";
        else first="B";
    }
    else{
        int temp2=press("X");
        if(temp2) first="X";
        else first="Y";
    }
    // for(ll i=0; i<4; i++){
    //     if(v[i]==first){
    //         v.erase(v.begin()+i);
    //     }
    // }
    ll cnt=2;
    for(int i=0;i<n-1; i++){
        string s1=first+fs+"A"+first+fs+"B";
        temp=press(s1);
        if(temp==cnt){
            s1=first+fs+"A";
            temp=press(s1);
            if(temp==cnt){
                fs+="A";
            }
            else{
                fs+="B";
            }
        }
        else{
            s1=first+fs+"X";
            temp=press(s1);
            if(temp==cnt){
                fs+="X";
            }
            else{
                fs+="Y";
            }
        }
        cnt++;
    }
    return first+fs;
}

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95