Submission #949277

#	Time	Username	Problem	Language	Result	Execution time	Memory
949277		Alihan_8	Painting Walls (APIO20_paint)	C++17	100 / 100	318 ms	12392 KiB

paint

#include <bits/stdc++.h>

#include "paint.h"

using namespace std;

#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
//#define int long long

using i64 = long long;

template <class F, class _S>
bool chmin(F &u, const _S &v){
    bool flag = false;
    if ( u > v ){
        u = v; flag |= true;
    }
    return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
    bool flag = false;
    if ( u < v ){
        u = v; flag |= true;
    }
    return flag;
}

int minimumInstructions(int n, int m, int k, std::vector<int> C,
    std::vector<int> A, std::vector<std::vector<int>> B) {

    vector <int> R(n), L(n);
    auto match = [&](int i, int j){
        return binary_search(all(B[j]), C[i]);
    };
    for ( int i = 0; i < n; i++ ){
        int l = i - 1, j = 0;
        while ( j < m && l + 1 < n && match(l + 1, j) ){
            l++, j++;
        } R[i] = j;
    }
    for ( int i = n - 1; i >= 0; i-- ){
        int l = i + 1, j = 0;
        while ( j < m && l - 1 >= 0 && match(l - 1, m - j - 1) ){
            l--, j++;
        } L[i] = j;
    }
    vector <int> pf(n + 1);
    for ( int i = 0; i < n; i++ ){
        int l = i - (i > 0 ? L[i - 1] : 0), r = i - (m - R[i]);
        if ( l <= r ){
            pf[l]++, pf[r + 1]--;
        }
    }
    for ( int i = 1; i < n; i++ ){
        pf[i] += pf[i - 1];
    }
    set <int> st;
    for ( int i = 0; i < n; i++ ){
        if ( pf[i] > 0 ){
            st.insert(i);
        }
    }
    int x = 0, cnt = 0;
    while ( x < n ){
        auto it = st.lower_bound(x + 1);
        if ( it == st.begin() || *prev(it) + m - 1 < x ){
            return -1;
        } cnt++;
        x = *prev(it) + m;
    }
    return cnt;
}

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