Submission #812117

#	Time	Username	Problem	Language	Result	Execution time	Memory
812117		becaido	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	1 ms	468 KiB

messy

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,popcnt,sse4,abm")
#include <bits/stdc++.h>
using namespace std;

#ifndef WAIMAI
#include "messy.h"
#endif

#define ll long long
#define Waimai ios::sync_with_stdio(false), cin.tie(0)
#define FOR(x,a,b) for (int x = a, I = b; x <= I; x++)
#define pb emplace_back
#define F first
#define S second

#ifdef WAIMAI
void add_element(string x);
bool check_element(string x);
void compile_set();
#endif

vector<int> restore_permutation(int n, int w, int r) {
    vector<int> p(n, -1);
    auto ask = [&](auto ask, int l, int r)->void {
        if (l == r) return;
        string s(n, '0');
        FOR (i, 0, l - 1) s[i] = '1';
        FOR (i, r + 1, n - 1) s[i] = '1';
        int mid = (l + r) / 2;
        FOR (i, l, mid) {
            s[i] = '1';
            add_element(s);
            s[i] = '0';
        }
        ask(ask, l, mid);
        ask(ask, mid + 1, r);
    };
    ask(ask, 0, n - 1);
    compile_set();
    auto rec = [&](auto rec, int l, int r, vector<int> cand)->void {
        if (l == r) {
            p[l] = cand[0];
            return;
        }
        string s(n, '1');
        for (int x : cand) s[x] = '0';
        vector<int> nc[2];
        for (int x : cand) {
            s[x] = '1';
            nc[!check_element(s)].pb(x);
            s[x] = '0';
        }
        int mid = (l + r) / 2;
        rec(rec, l, mid, nc[0]);
        rec(rec, mid + 1, r, nc[1]);
    };
    vector<int> cand(n), tmp;
    iota(cand.begin(), cand.end(), 0);
    rec(rec, 0, n - 1, cand);
    tmp = p;
    FOR (i, 0, n - 1) p[tmp[i]] = i;
    return p;
}

/*
in1
4 16 16
2 1 3 0
out1
2 1 3 0
*/

#ifdef WAIMAI
namespace helper {

    set<string> set_;
    bool compiled = false;
    int n;
    vector<int> p;
    int w;
    int r;

    int read_int() {
        int x;
        cin >> x;
        return x;
    }

}

using namespace helper;


// A convenience function.
int get_p(int i) {
    int ret = p[i];
    return ret;
}

int main() {
    n = read_int();
    w = read_int();
    r = read_int();
    p = vector<int>(n);
    for (int i = 0; i < n; i++) {
        p[i] = read_int();
    }
    vector<int> answer = restore_permutation(n, w, r);

    if (answer.size() != n) {
        printf("WA\n");
        return 0;
    }


    printf("%d", answer[0]);

    for (int i = 1; i < n; i++) {
        printf(" %d", answer[i]);
    }
    printf("\n");
    return 0;
}

void wa() {
    printf("WA\n");
    exit(0);
}

bool check(const string& x) {
    if ((int)x.length() != n) {
        return false;
    }
    for (int i = 0; i < n; i++) {
        if (x[i] != '0' && x[i] != '1') {
            return false;
        }
    }
    return true;
}

void add_element(string x) {
    if (--w < 0 || compiled || !check(x)) {
        wa();
    }
    set_.insert(x);
}

bool check_element(string x) {
    if (--r < 0 || !compiled || !check(x)) {
        wa();
    }
    return set_.count(x);
}

void compile_set() {
    if (compiled) {
        wa();
    }
    compiled = true;
    set<string> compiledSet;
    string compiledElement = string(n, ' ');
    for (set<string>::iterator it = set_.begin(); it != set_.end(); it++) {
        string s = *it;
        for (int i = 0; i < n; i++) {
            compiledElement[i] = s[get_p(i)];
        }
        compiledSet.insert(compiledElement);
    }
    set_ = compiledSet;
}
#endif

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30