제출 #807621

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
807621		ttamx	Bit Shift Registers (IOI21_registers)	C++17	21 / 100	0 ms	212 KiB

registers

#include "registers.h"
#include "bits/stdc++.h"

using namespace std;

const int B=2000;
const int ONE=99;
const int ALT=98;
const int FILL=97;

void construct_instructions(int s, int n, int k, int q) {
	vector<bool> b1(B),b2(B),b3(B);
	for(int i=0;i<n;i+=2*k)b1[i]=1;
	append_store(ONE,b1);
	for(int i=0;i<n;i+=2*k)for(int j=0;j<k;j++)b2[i+j]=1;
	append_store(ALT,b2);
	while(n!=n&-n)b3[n++]=1;
	append_store(FILL,b3);
	append_or(0,0,FILL);
	if(s==0){
		int cnt=k;
		while(n>1){
			append_right(1,0,cnt);
			append_and(0,0,ALT); // A
			append_and(1,1,ALT); // B
			append_not(2,1); // - B - 1
			append_add(2,0,2); // A - B - 1
			append_right(2,2,k);
			append_and(2,2,ONE);
			append_add(2,2,ALT);
			append_and(1,1,2);
			append_not(2,2);
			append_and(0,0,2);
			append_or(0,0,1);
			n>>=1;
			cnt<<=1;
		}
	}
}

컴파일 시 표준 에러 (stderr) 메시지

registers.cpp: In function 'void construct_instructions(int, int, int, int)':
registers.cpp:17:9: warning: self-comparison always evaluates to false [-Wtautological-compare]
   17 |  while(n!=n&-n)b3[n++]=1;
      |        ~^~~
registers.cpp:17:9: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   17 |  while(n!=n&-n)b3[n++]=1;
      |        ~^~~

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 0 / 12
• Subtask 4: 0 / 25
• Subtask 5: 0 / 13
• Subtask 6: 0 / 29