Submission #802850

#	Time	Username	Problem	Language	Result	Execution time	Memory
802850		SlavicG	Prisoner Challenge (IOI22_prison)	C++17	0 / 100	6 ms	724 KiB

prison

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

#define sz(x) (int)x.size()
#define pb push_back 

int n;
vector<vector<int>> st;
void rec(int idx, vector<int> elements) {
    if(elements.empty()) return;
    while(sz(st) <= idx) st.pb(vector<int>(n + 1));
    int p = ((idx + 2) / 3) % 2;
    st[idx][0] = p;
    vector<int> A, B, C;
    for(int j = 1; j <= n; ++j) {
        if(j > elements.back()) st[idx][j] = (!p ? -2 : -1);
        if(j < elements[0]) st[idx][j] = (!p ? -1 : -2);
    }
    st[idx][elements[0]] = (!p ? -1 : -2);
    st[idx][elements.back()] = (!p ? -2 : -1);
    elements.erase(elements.begin());
    if(sz(elements)) elements.pop_back();
    for(int i = 0; i < sz(elements) / 3; ++i) A.push_back(elements[i]);
    for(int i = sz(elements) / 3; i < sz(elements) / 3 * 2; ++i) B.push_back(elements[i]);
    for(int i = sz(elements) / 3 * 2; i < sz(elements); ++i) C.push_back(elements[i]);
    //if(sz(C) > sz(A)) swap(A, C);
    int pp = (idx + 2) / 3 * 3; 
    for(auto x: A) st[idx][x] = pp + 1;
    for(auto x: B) st[idx][x] = pp + 2;
    for(auto x: C) st[idx][x] = pp + 3;
    rec(pp + 1, A);
    rec(pp + 2, B);
    rec(pp + 3, C);
} 
std::vector<std::vector<int>> devise_strategy(int N) {
    n = N;
    vector<int> elements(N);
    iota(elements.begin(), elements.end(), 1);
    rec(0, elements);
    return st;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 90