Submission #1077428

#	Time	Username	Problem	Language	Result	Execution time	Memory
1077428		GrindMachine	Painting Walls (APIO20_paint)	C++17	63 / 100	486 ms	524288 KiB

paint

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")

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

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 conts continue
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define ff first
#define ss second

#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 &x, T y){
    x = min(x,y);
}

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

template<typename A,typename B>
string to_string(pair<A,B> p);

string to_string(const string &s){
    return "'"+s+"'";
}

string to_string(const char* s){
    return to_string((string)s);
}

string to_string(bool b){
    return b?"true":"false";
}

string to_string(vector<bool> v){
    string res = "{";
    rep(i,sz(v)){
        res += to_string(v[i])+",";
    }
    if(res.back() == ',') res.pop_back();
    res += "}";
    return res;
}

template<typename A>
string to_string(A v){
    string res = "{";
    trav(x,v){
        res += to_string(x)+",";
    }
    if(res.back() == ',') res.pop_back();
    res += "}";
    return res;
}

template<typename A,typename B>
string to_string(pair<A,B> p){
    return "("+to_string(p.ff)+","+to_string(p.ss)+")";
}

#define debug(x) cout << "[" << #x << "]: "; cout << to_string(x) << endl

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

#include "paint.h"

int minimumInstructions(
    int n, int m, int k, std::vector<int> a,
    std::vector<int> sizes, std::vector<std::vector<int>> b) {

    vector<int> here[k];
    rep(j,m){
        trav(x,b[j]){
            here[x].pb(j);
        }
    }

    vector<int> enter[n], leave[n];
    rep(i,n){
        trav(j,here[a[i]]){
            int shift = min(i,m-1);
            int x = (j-shift+m)%m;
            enter[i-shift].pb(x);
            leave[i].pb(j);
        }
    }

    int ref = 0;
    vector<int> val(m);
    int mc = 0;

    auto rot = [&](){
        if(ref == 0) ref = m-1;
        else ref--;
    };

    auto upd = [&](int x, int v){
        x = (x+ref)%m;
        mc -= (val[x] == m);
        val[x] += v;
        mc += (val[x] == m);
    };

    vector<bool> can(n);

    rep(i,n){
        if(i+m-1 >= n) break;
        if(i) rot();

        trav(x,enter[i]){
            upd(x,1);
        }

        if(mc){
            can[i] = 1;
        }

        trav(x,leave[i]){
            upd(x,-1);
        }
    }

    // rep(i,n){
    //     if(i+m-1 >= n) break;
    //     rep(x,m){
    //         bool ok = true;
    //         rep(l,m){
    //             int j = (x+l)%m;
    //             if(!binary_search(all(b[j]),a[i+l])){
    //                 ok = false;
    //                 break;
    //             }
    //         }

    //         if(ok){
    //             can[i] = 1;
    //             break;
    //         }
    //     }
    // }

    vector<int> bef(n,-1);
    rep(i,n){
        if(i) bef[i] = bef[i-1];
        if(can[i]) bef[i] = i;
    }

    if(!can[0]){
        return -1;
    }

    int pos = 0;
    int ans = 1;

    while(pos+m < n){
        int nxt = bef[pos+m];
        if(nxt == pos) return -1;
        pos = nxt;
        ans++;
    }

    return ans;
}

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