Submission #415223

#	Time	Username	Problem	Language	Result	Execution time	Memory
415223		fvogel499	cmp (balkan11_cmp)	C++14	82 / 100	2675 ms	94432 KiB

cmp

/*
File created on 05/31/2021 at 18:32:22.
Link to problem: https://oj.uz/problem/view/balkan11_cmp
Description: https://usaco.guide/adv/interactive?lang=cpp#tip-1---dont-send-everything
Time complexity: irrelevant
Space complexity: irrelevant
Status: DEV
Copyright: Ⓒ 2021 Francois Vogel
*/

#include <iostream>
#include <vector>
#include "cmp.h"

using namespace std;

vector<int> start = {0, 4, 20, 84, 340, 965, 2261};

// const int N = 10241;
// bool bits [N];
// void bit_set(int i) {
//     bits[i] = true;
// }
// void bit_reset(int i) {
//     bits[i] = false;
// }
// bool bit_get(int i) {
//     return bits[i];
// }
// void undo(int n) {
//     for (int i = 0; i < 6; i++) {
//         int cons = n>>(2*(5-i));
//         bit_reset(cons+start[i]+1);
//     }
// }

void remember(int n) {
    for (int i = 0; i < 6; i++) {
        int cons = n>>(2*(5-i));
        bit_set(cons+start[i]+1);
    }
}

int compare(int n) {
    int l = 0;
    int r = 5;
    while (l <= r) {
        int mid = (l+r)/2;
        if (l+1 == r) mid++;
        int cons = n>>(2*(5-mid));
        bool res = bit_get(start[mid]+cons+1);
        if (res) {
            l = mid;
            if (r == l) break;
        }
        else r = mid-1;
    }
    if (l == 5 and r == 5) return 0;
    if (r == -1 and l == 0) l = 0;
    else l++;
    int cons = n>>(2*(5-l));
    if (cons%4 == 0) return -1;
    else if (cons%4 == 3) return 1;
    else if (cons%4 == 1) {
        bool res = bit_get(start[l]+cons-1+1);
        if (res) return 1;
        else return -1;
    }
    else if (cons%4 == 2) {
        bool res = bit_get(start[l]+cons+1+1);
        if (res) return -1;
        else return 1;
    }
}

// int main() {
//     for (int i = 0; i < N; i++) bits[i] = false;

//     int lim = 4096;
//     for (int i = 0; i < lim; i++) {
//         if (i%200 == 0) cout << endl << "PROGRESS: " << (i*100)/lim << " |";
//         else if (i%100 == 0) cout << ".";
//         for (int j = 0; j < 4096; j++) {
//             // cout << endl << "RUNNING: " << i << " " << j;
//             remember(i);
//             int res = compare(j);
//             undo(i);
//             if ((res == 0 and i != j) or (res == -1 and i <= j) or (res == 1 and i >= j)) {
//                 cout <<  endl << "-> PROBLEM: " << i << " " << j;
//             }
//         }
//     }
//     int d = 0;
//     d++;
// }

Compilation message (stderr)

cmp.cpp: In function 'int compare(int)':
cmp.cpp:74:1: warning: control reaches end of non-void function [-Wreturn-type]
   74 | }
      | ^

• Subtask 1: 82 / 100