Submission #831838

#	Time	Username	Problem	Language	Result	Execution time	Memory
831838		matthewhutama	콤보 (IOI18_combo)	C++14	100 / 100	27 ms	640 KiB

combo

#include "combo.h"
// #include <cstdio>
// #include <cstdlib>
// #include <algorithm>
// #include <string>
// #include "combo.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
std::string guess_sequence(int N) {
    string ans;
    string opsi;
    if (press("AB") >= 1){
        if (press("A") == 1){
            ans = "A";
            opsi = "BXY";
        }
        else{
            ans = "B"; opsi = "AXY";
        }
    }
    else{
        if (press("X") == 1){
            ans = "X"; opsi = "ABY";
        }
        else{
            ans = "Y"; opsi = "ABX";
        }
    }
    
    if (N == 1) return ans;

    for (int i = 2; i < N; i++){
        string fi = ans + opsi[0], se = ans + opsi[1];
        string ask = fi + se + opsi[0] + se + opsi[1] + se + opsi[2];
        // cout<<ask<<"PPP"<<endl;
        ll u = press(ask);
        // cout<<u<<endl;
        if (u == ans.size() + 1){
            ans = fi;
        }
        else if (u == ans.size() + 2){
            ans = se;
        }
        else{
            ans = ans + opsi[2];
        }
        // cout<<ans<<endl;
    }

    if (press(ans + opsi[0]) == N){
        ans += opsi[0];
    }
    else if (press(ans + opsi[1]) == N){
        ans += opsi[1];
    }
    else{
        ans += opsi[2];
    }
    // cout<<ans;
    return ans;

}

// 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;
// }

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:39:15: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         if (u == ans.size() + 1){
      |             ~~^~~~~~~~~~~~~~~~~
combo.cpp:42:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         else if (u == ans.size() + 2){
      |                  ~~^~~~~~~~~~~~~~~~~

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