Submission #974965

#	Time	Username	Problem	Language	Result	Execution time	Memory
974965		hirayuu_oj	Painting Walls (APIO20_paint)	C++17	100 / 100	685 ms	14940 KiB

paint

#include "paint.h"
#include <algorithm>
#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<n; i++)
#define all(x) x.begin(),x.end();
using ll=long long;

inline int safe_mod(int x,int y){
    int ret=x%y;
    if(ret<0){
        ret+=y;
    }
    return ret;
}
int minimumInstructions(
        int N, int M, int K, std::vector<int> C,
        std::vector<int> A, std::vector<std::vector<int>> B) {
    vector<vector<int>> cols(K);
    rep(i,M){
        for(int j:B[i]){
            cols[j].emplace_back(i);
        }
    }
    vector<int> seg(M);
    vector<int> can(N,-1);
    int cnt=0;
    rep(i,N){
        for(int j:cols[C[i]]){
            seg[safe_mod(j-i,M)]++;
            if(seg[safe_mod(j-i,M)]==M)cnt++;
        }
        if(cnt){
            can[i-M+1]=i-M+1;
        }
        if(i-M+1>=0){
            for(int j:cols[C[i-M+1]]){
                if(seg[safe_mod(j-(i-M+1),M)]==M)cnt--;
                seg[safe_mod(j-(i-M+1),M)]--;
            }
        }
    }
    rep(i,N){
        if(i<N-1)can[i+1]=max(can[i],can[i+1]);
    }
    int pos=0;
    int ans=0;
    while(pos<N){
        if(can[pos]==-1)return -1;
        if(can[pos]+M<=pos)return -1;
        pos=can[pos]+M;
        ans++;
    }
    return ans;
}

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