Submission #951571

#	Time	Username	Problem	Language	Result	Execution time	Memory
951571		GrindMachine	Navigation 2 (JOI21_navigation2)	C++17	85 / 100	563 ms	2400 KiB

Anna

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi
https://codeforces.com/blog/entry/88748?#comment-774016 (this thread)

*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "Anna.h"

void Anna(int n, int k, std::vector<int> R, std::vector<int> C) {
    int a[n][n];
    rep(i,n) rep(j,n) a[i][j] = 1;

    vector<bool> used(10);

    rep(i,n){
        rep(j,n){
            int ind = (i%3)*3+(j%3);
            if(!ind){
                a[i][j] = 14;
            }
            else{
                if(ind <= k){
                    int r = R[ind-1], c = C[ind-1];
                    int d = max(abs(i-r),abs(j-c));
                    if(d > 1){
                        // (i,j+1)
                        if(j+2 <= c){
                            a[i][j] = 10;
                        }
                        // (i,j-1)
                        else if(j-2 >= c){
                            a[i][j] = 11;
                        }
                        // (i+1,j)
                        else if(i+2 <= r){
                            a[i][j] = 12;
                        }
                        // (i-1,j)
                        else if(i-2 >= r){
                            a[i][j] = 13;
                        }
                        else{
                            assert(0);
                        }
                    }
                    else{
                        int d1 = i-r+1, d2 = j-c+1;
                        a[i][j] = (d1*3)+d2+1;
                        used[a[i][j]] = 1;
                    }
                }
            }
        }
    }

    int unused = -1;
    rep1(i,9){
        if(!used[i]){
            unused = i;
            break;
        }
    }

    assert(unused != -1);
    assert(unused <= 8);

    rep(i,n){
        rep(j,n){
            int ind = (i%3)*3+(j%3);
            if(ind == 8){
                a[i][j] = unused;
            }
            else{
                if(a[i][j] > unused){
                    a[i][j]--;
                }
            }
        }
    }

    rep(i,n){
        rep(j,n){
            SetFlag(i,j,a[i][j]);
        }
    }
}

Bruno

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi
https://codeforces.com/blog/entry/88748?#comment-774016 (this thread)

*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "Bruno.h"

std::vector<int> Bruno(int k, std::vector<int> values) {
    int a[3][3];
    memset(a,0,sizeof a);
    rep(i,sz(values)){
        a[i/3][i%3] = values[i];
    }

    int zi = -1, zj = -1;
    rep(i,3){
        rep(j,3){
            if(a[i][j] == 13){
                assert(zi == -1);
                zi = i, zj = j;
            } 
        }
    }

    assert(zi != -1);

    int label[3][3];
    label[zi][zj] = 0;

    rep1(iter,8){
        if(iter%3 == 0){
            zi = (zi+1)%3;
        }
        zj = (zj+1)%3;
        label[zi][zj] = iter;
    }

    int unused = a[zi][zj];
    rep(i,3){
        rep(j,3){
            if(a[i][j] >= unused){
                a[i][j]++;
            }
        }
    }

    vector<int> di = {0,0,1,-1,0};
    vector<int> dj = {1,-1,0,0,0};

    vector<int> ans(k);
    rep(i,3){
        rep(j,3){
            int ind = label[i][j];
            if(!ind or ind > k) conts;

            ind--;
            pii cell = {-1,-1};

            if(a[i][j] > 9){
                int x = a[i][j]-10;
                ans[ind] = x;
                conts;
            }
            else{
                int v = a[i][j]-1;
                cell = {i,j};
                auto &[r,c] = cell;

                if(v == 0){
                    r++, c++;
                }
                if(v == 1){
                    r++;
                }
                if(v == 2){
                    r++, c--;
                }
                if(v == 3){
                    c++;
                }
                if(v == 4){

                }
                if(v == 5){
                    c--;
                }
                if(v == 6){
                    r--, c++;
                }
                if(v == 7){
                    r--;
                }
                if(v == 8){
                    r--, c--;
                }
            }

            auto [r,c] = cell;
            int dir = 4;

            // (i,j+1)
            if(1 < c){
                dir = 0;
            }
            // (i,j-1)
            else if(1 > c){
                dir = 1;
            }
            // (i+1,j)
            else if(1 < r){
                dir = 2;
            }
            else if(1 > r){
                dir = 3;
            }

            ans[ind] = dir;
        }
    }

    return ans;
}

• Subtask 1: 85 / 100