Submission #737655

#	Time	Username	Problem	Language	Result	Execution time	Memory
737655		Abrar_Al_Samit	Painting Walls (APIO20_paint)	C++17	28 / 100	91 ms	135064 KiB

paint

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



const int nax = 1e5;
const int snax = 1e4;


vector<int> col_to_wall[nax], cand[nax];
vector<bitset<nax/2>>is(snax);
bool good[nax];
bool on[nax];

int minimumInstructions(
    int N, int M, int K, vector<int> C,
    vector<int> A, vector<vector<int>> B) {

    
    for(int i=0; i<N; ++i) {
        col_to_wall[C[i]].push_back(i);
    }

    for(int i=0; i<M; ++i) {
        for(int j=0; j<A[i]; ++j) {
            for(int x : col_to_wall[B[i][j]]) {
                cand[x].push_back(i);
                is[x][i] = 1;
            }
        }
    }

    int prev_succ = -1;
    for(int i=0; i<=N-M; ++i) {
        int cur_succ = -1;
        for(int j : cand[i]) {

            int pre_tag = (j-1+M)%M;
            bool yasss = true;


            if(pre_tag==prev_succ) {
                if(i+M-1<snax) {
                    if(is[i+M-1][pre_tag]) {
                        cur_succ = j;
                        break;
                    } else continue;
                } else {
                    if(binary_search(cand[i+M-1].begin(), cand[i+M-1].end(), pre_tag)) {
                        cur_succ = j;
                        break;
                    } else continue;
                }
            } else if(on[pre_tag]) {
                continue;
            }

            for(int l=1, cr=j+1; l<M; ++l, ++cr) {
                if(cr==M) cr = 0;

                if(i+l<snax) yasss &= is[i+l][cr];
                else yasss &= binary_search(cand[i+l].begin(), cand[i+l].end(), cr);

                if(!yasss) break;
            }
            if(yasss) {
                cur_succ = j;
                break;
            }
        }
        if(i) {
            for(int x : cand[i-1]) {
                if(x==prev_succ) break;
                on[x] = 0;
            }
        }
        for(int x : cand[i]) {
            if(x==cur_succ) break;
            on[x] = 1;
        }

        prev_succ = cur_succ;
        if(cur_succ!=-1) {
            good[i] = 1;
        }
    }


    if(!good[0]) return -1;
    int last = 0, pending = -1;

    int ans = 1;
    for(int i=1; i<N; ++i) {
        if(good[i]) {
            pending = i;
        }
        if(last+M==i) {
            if(pending==-1) return -1;
            last = pending;
            pending = -1;
            ++ans;
        }
    }
    return ans;
}

• Subtask 1: 0 / 12
• Subtask 2: 15 / 15
• Subtask 3: 13 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 37