Submission #987636

#	Time	Username	Problem	Language	Result	Execution time	Memory
987636		Tsagana	Cave (IOI13_cave)	C++14	100 / 100	837 ms	800 KiB

cave

#include "cave.h"

#include<bits/stdc++.h>

#define all(x) x.begin(), x.end()
#define pq priority_queue
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define eb emplace_back
#define F first
#define S second

using namespace std;

bitset<5069> spc;
int n, a[5001], sq[5001];

int qr(int ky, int x) {
    for (int i = 0; i < n; i++) {
        if (sq[i] < n) a[i] = spc[sq[i]];
        else a[i] = ky ^ i <= x;
    }
    return tryCombination(a);
}
void exploreCave(int N) {
    int rh, md, zz; n = N;
    for (int i = 0; i < n; i++) sq[i]=n;
    for (int i = 0; i < n; i++) {
        spc[i] = (qr(1, n-1) == i);
        for (int lh = 0, rh = n-1; lh <= rh;) {
            md = (lh + rh) / 2;
            if (qr(spc[i], md) == i) {zz = md; rh = md-1;}
            else lh = md + 1;
        }
        sq[zz] = i;
    }
    for (int i = 0; i < n; i++) a[i] = spc[sq[i]];
    answer(a, sq);
}

Compilation message (stderr)

cave.cpp: In function 'int qr(int, int)':
cave.cpp:22:28: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
   22 |         else a[i] = ky ^ i <= x;
      |                          ~~^~~~
cave.cpp: In function 'void exploreCave(int)':
cave.cpp:27:9: warning: unused variable 'rh' [-Wunused-variable]
   27 |     int rh, md, zz; n = N;
      |         ^~
cave.cpp:36:16: warning: 'zz' may be used uninitialized in this function [-Wmaybe-uninitialized]
   36 |         sq[zz] = i;
      |         ~~~~~~~^~~

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24