Submission #314254

#	Time	Username	Problem	Language	Result	Execution time	Memory
314254		Vladth11	Combo (IOI18_combo)	C++14	0 / 100	1 ms	200 KiB

combo

#include <bits/stdc++.h>
#define debug(x) cerr << #x << " " << x << "\n"
#define debug_with_space(x) cerr << #x << " " << x << " "

using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <int, pii> piii;

const ll NMAX = 200001;
const ll INF = (1 << 30);
const ll MOD = 1000000007;
const ll BLOCK = 101;
const ll nr_of_bits = 18;

int press(string p);

char ch[] = {'A', 'B', 'X', 'Y'};
int viz[5];

string guess_sequence(int N){
    string s = "";
    for(int i = 0; i < 4; i++)
        viz[i] = 0;
    if(press("AB")){
        if(press("A")){
            s += "A";
            viz[0] = 1;
        }else{
            s += "B";
            viz[1] = 1;
        }
    }else{
        if(press("X")){
            s += "X";
            viz[2] = 1;
        }else{
            s += "Y";
            viz[3] = 1;
        }
    }
    for(int i = 2; i < N; i++){
        string intrb = "";
        int cnt = 2;
        char a ;
        char b;
        char cc;
        for(int i = 0; i < 4; i++){
            if(!viz[i] && cnt == 2){
                intrb += s;
                a = ch[i];
                intrb += ch[i];
                cnt--;
            }else if(!viz[i] && cnt == 1){
                b = ch[i];
                for(int x = 0; x < 4; x++){
                    if(!viz[x]){
                        intrb += s;
                        intrb += ch[i];
                        intrb += ch[x];
                    }
                }
                cnt--;
            }else if(!viz[i]){
                cc = ch[i];
            }
        }
        int ras = press(intrb);
        if(ras == i){
            s += a;
        }else if(ras == i + 1){
            s += b;
        }else{
            s += cc;
        }
    }
    char a, b, cc;
    int cnt = 3;
    for(int i = 0; i < 4; i++){
        if(!viz[i] && cnt == 3){
            a = ch[i];
        }else if(!viz[i] && cnt == 2){
            b = ch[i];
        }else if(!viz[i]){
            cc = ch[i];
        }
    }
    string intrb = "";
    intrb += s;
    if(press((intrb + a)) == N){
        s += a;
    }else if(press((intrb + b)) == N){
        s += b;
    }else{
        s += cc;
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:92:29: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   92 |     }else if(press((intrb + b)) == N){
      |                             ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95