Submission #714605

#	Time	Username	Problem	Language	Result	Execution time	Memory
714605		MDSPro	Painting Walls (APIO20_paint)	C++14	0 / 100	1590 ms	163432 KiB

paint

#include "paint.h"

#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
using namespace std;

const int INF = 1e9;
struct SegTree {
    int n,N;
    vector<int> tr;

    SegTree(int sz):n(sz){
        N = (1<<(32-__builtin_clz(n)));
        tr.assign(2*N,INF);
    }

    void upd(int idx, int val){
        for(idx += N, tr[idx] = val, idx >>= 1; idx > 0; idx >>= 1) tr[idx] = min(tr[idx<<1],tr[idx<<1|1]);
    }

    int get(int l, int r){
        int ans = INF;
        for(l += N, r += N; l < r; l >>= 1, r >>= 1){
            if(l&1) ans = min(tr[l++],ans);
            if(r&1) ans = min(ans,tr[--r]);
        }

        return ans;
    }
};

int minimumInstructions(int N, int M, int K, std::vector<int> C, std::vector<int> A, std::vector<std::vector<int>> B) {
    // [y,y+M-1]
    vector<set<int>> BB;
    for(auto z: B) {
        BB.emplace_back(set<int>(z.begin(),z.end()));
    }
    //  M = 3 
    // [1 0 1]
    // [1 1 1]
    // [1 1 0]
    // [0 0 1] N-M = 3
    // [1 1 0]
    // [0 1 1]
    vector<vector<int>> dp1(N, vector<int>(M,0));
    vector<pair<int,int>> segs;
    for(int y = N-1; y >= 0; --y){
        for(int x = 0; x < M; ++x){
            if(BB[x].count(C[y])) {
                if(y == N-1) dp1[y][x] = 1;
                else dp1[y][x] = dp1[y+1][(x+1)%M]+1;
            }

            if(dp1[y][x] >= M) {
                segs.emplace_back(y,y+M-1);
                break;
            }
        }
    }

    sort(segs.begin(),segs.end());

    SegTree sg(N);
    vector<int> dp(N,INF);
    for(auto z: segs){
        int l = z.first, r = z.second;
        if(l == 0) dp[r] = 1;
        else dp[r] = min(sg.get(l-1,r)+1,dp[r]);
        sg.upd(r,dp[r]);
    }

    if(dp[N-1] == INF) return -1;
    else return dp[N-1];
};


// O(N*M*logC+N*logN)

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