Submission #95595

#	Time	Username	Problem	Language	Result	Execution time	Memory
95595		cheeheng	Combo (IOI18_combo)	C++14	30 / 100	70 ms	436 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;

char lookup[] = {'A','B','X','Y'};

//int press(std::string p);

string guess_sequence(int N) {
    string p = "";
    for(int i = 1; i <= N; i ++){
        int tries = 0;
        bool found = false;

        for(int j = 0; j < 3; j ++){
            if(i >= 2 && p[0]==lookup[j]){continue;}
            if(tries == 2 && i >= 2){ p+=lookup[j];found=true;break;}

            tries ++;
            if(press(p+lookup[j]) == i){
                p += lookup[j];
                found = true;
                //printf("%d %s\n", i, p.c_str());
                break;
            }
        }
        if(!found){
            p += lookup[3];
        }
        //printf("%d %s\n", i, p.c_str());
    }
    return p;
}

/*
namespace {

constexpr int MAX_N = 2000;
constexpr int MAX_NUM_MOVES = 8000;

int N;
std::string S;

int num_moves;

void wrong_answer(const char *MSG) {
  printf("Wrong Answer: %s\n", MSG);
  exit(0);
}

}  // namespace


int press(std::string p) {
  if (++num_moves > MAX_NUM_MOVES) {
    wrong_answer("too many moves");
  }
  int len = p.length();
  if (len > 4 * N) {
    wrong_answer("invalid press");
  }
  for (int i = 0; i < len; ++i) {
    if (p[i] != 'A' && p[i] != 'B' && p[i] != 'X' && p[i] != 'Y') {
      wrong_answer("invalid press");
    }
  }
  int coins = 0;
  for (int i = 0, j = 0; i < len; ++i) {
    if (j < N && S[j] == p[i]) {
      ++j;
    } else if (S[0] == p[i]) {
      j = 1;
    } else {
      j = 0;
    }
    coins = std::max(coins, j);
  }
  return coins;
}

int main() {
  char buffer[MAX_N + 1];
  if (scanf("%s", buffer) != 1) {
    fprintf(stderr, "Error while reading input\n");
    exit(1);
  }
  S = buffer;
  N = S.length();

  num_moves = 0;
  std::string answer = guess_sequence(N);
  if (answer != S) {
    wrong_answer("wrong guess");
    exit(0);
  }
  printf("Accepted: %d\n", num_moves);
  return 0;
}
*/

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