제출 #173048

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
173048		gs13068	Hotter Colder (IOI10_hottercolder)	C++17	0 / 100	905 ms	8344 KiB

hottercolder

#include "grader.h"
#include <cmath>

int cal(int n) {
  return n < 5 ? 1 : (n + 1 >> 1) - cal(n >> 1);
}

int HC(int N){
  int L = 1, R = N, prv, nxt, t, W = log(3 * N) / log(2);
  while (L < R) {
    if (R == 2) {
      Guess(1);
      return Guess(2) < 0 ? 1 : 2;
    }
    int cut = (2 << W - 2) / 3 + 1;
    nxt = R == N ? cut + cal(R - cut) : cut + cut - 1;
    prv = cut + cut - nxt;
    Guess(prv);
    t = Guess(nxt);
    if (t == -1) R = prv + nxt - 1 >> 1;
    if (t == 0) return prv + nxt >> 1;
    if (t == 1) {
      L = prv + nxt + 2 >> 1;
      prv = nxt;
      while (L < R) {
        nxt = (L + R >> 1 << 1) - prv;
        if (nxt == prv) nxt++;
        if (nxt < 1) nxt = 1;
        if (nxt > N) nxt = N;
        t = Guess(nxt);
        if (t == -1) {
          if (prv < nxt) R = nxt + prv - 1 >> 1;
          else L = nxt + prv + 2 >> 1;
        }
        if (t == 0) return nxt + prv >> 1;
        if (t == 1) {
          if (prv < nxt) L = nxt + prv + 2 >> 1;
          else R = nxt + prv - 1 >> 1;
        }
        prv = nxt;
      }
    }
    W -= 2;
  }
  return L;
}

컴파일 시 표준 에러 (stderr) 메시지

hottercolder.cpp: In function 'int cal(int)':
hottercolder.cpp:5:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   return n < 5 ? 1 : (n + 1 >> 1) - cal(n >> 1);
                       ~~^~~
hottercolder.cpp: In function 'int HC(int)':
hottercolder.cpp:15:23: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     int cut = (2 << W - 2) / 3 + 1;
                     ~~^~~
hottercolder.cpp:20:32: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
     if (t == -1) R = prv + nxt - 1 >> 1;
                      ~~~~~~~~~~^~~
hottercolder.cpp:21:28: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     if (t == 0) return prv + nxt >> 1;
                        ~~~~^~~~~
hottercolder.cpp:23:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
       L = prv + nxt + 2 >> 1;
           ~~~~~~~~~~^~~
hottercolder.cpp:26:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         nxt = (L + R >> 1 << 1) - prv;
                ~~^~~
hottercolder.cpp:32:40: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
           if (prv < nxt) R = nxt + prv - 1 >> 1;
                              ~~~~~~~~~~^~~
hottercolder.cpp:33:30: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
           else L = nxt + prv + 2 >> 1;
                    ~~~~~~~~~~^~~
hottercolder.cpp:35:32: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         if (t == 0) return nxt + prv >> 1;
                            ~~~~^~~~~
hottercolder.cpp:37:40: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
           if (prv < nxt) L = nxt + prv + 2 >> 1;
                              ~~~~~~~~~~^~~
hottercolder.cpp:38:30: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
           else R = nxt + prv - 1 >> 1;
                    ~~~~~~~~~~^~~

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