Submission #437022

#	Time	Username	Problem	Language	Result	Execution time	Memory
437022		model_code	Bit Shift Registers (IOI21_registers)	C++17	100 / 100	2 ms	460 KiB

registers

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

const int b = 2000;

void construct_instructions(int s, int n, int k, int q) {
    if(s==0) {
        vector<bool> v(b,0);
        for(int i=0; i<b; i++) {
            if(i%(2*k)==0) {
                v[i] = 1;
            }
        }
        append_store(3, v);
        vector<bool> mask_ones(b);
        for(int i=0; i<b; i++) {
            if((i/k)%2==0) {
                mask_ones[i] = 1;
            }
        }
        append_store(4, mask_ones);
        vector<bool> fill_up(b);
        for(int i=n*k; i<b; i++) {
            // ensure that we do not
            // accidentally take min with 0
            fill_up[i] = 1;
        }
        append_store(5, fill_up);
        append_or(0, 0, 5);
        int iter = 1 + (int)log2(n-0.001); // ceil(log2(n))
        int a = k;
        while(iter--) {
            append_right(1, 0, a); // we need to shift twice as many bits each time
            a *= 2;
            append_not(8, 1);
            append_and(8, 8, 4);
            append_and(0, 0, 4);
            append_add(2, 0, 8);
            append_right(2, 2, k); // always k bits, do not change

            append_and(2, 2, 3); // 2 should be 0...01 or 0....00
            append_add(2, 2, 4); // now 2 is 0....00 or 1....11
            append_and(6,2,0);
            append_not(7,2);
            append_and(7,1,7);
            append_or(0,6,7);
        }
    } else {
        vector<bool> v(b,0);
        for(int i=0; i<b; i++) {
            if(i%(2*k)==0) {
                v[i] = 1;
            }
        }
        append_store(3, v);
        vector<bool> mask_ones(b);
        for(int i=0; i<b; i++) {
            if((i/k)%2==0) {
                mask_ones[i] = 1;
            }
        }
        append_store(4, mask_ones);
        vector<bool> fill_up(b);
        for(int i=n*k; i<b; i++) {
            // ensure that we do not
            // accidentally take min with 0
            fill_up[i] = 1;
        }
        append_store(5, fill_up);
        append_or(0, 0, 5);
        for(int iter=0; iter<n; iter++) {
            if(iter%2==0) {
                append_right(1, 0, k); // we need to shift twice as many bits each time
            } else {
                append_left(1, 0, k);
            }
            append_not(8, 1);
            append_and(8, 8, 4);
            append_and(0, 0, 4);
            append_add(2, 0, 8);
            append_right(2, 2, k); // always k bits, do not change

            append_and(2, 2, 3); // 2 should be 0...01 or 0....00
            append_add(2, 2, 4); // now 2 is 0....00 or 1....11

            append_not(7,2);

            append_and(6,2,0);
            append_and(8,1,7);
            append_or(10,6,8);
            append_and(10,10,4);

            append_and(6,2,1);
            append_and(8,7,0);
            append_or(9,6,8);
            append_and(9,9,4);
            if(iter%2==0) {
                append_left(9,9,k);
            } else {
                append_right(10,10,k);
            }
            append_or(0,9,10);
        }
        append_not(5,5);
        append_and(0,0,5);
    }


    return;
}

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