Submission #102893

#	Time	Username	Problem	Language	Result	Execution time	Memory
102893		daniel920712	Paint By Numbers (IOI16_paint)	C++14	100 / 100	1333 ms	86420 KiB

paint

#include <iostream>
#include <stdio.h>
#include <vector>
#include <utility>
#include <queue>
#include "paint.h"
using namespace std;
bool Can[2][200005]={0};
int N,M;
bool have[200005][105][2]={0};
bool can[200005][105][2]={0};
int How[200005]={0};
int how[200005]={0};
int Big[200005];
string a;
vector < int > c;
void F2()
{
    int here,what,x,t;
    pair < pair < int ,int > , int > temp;
    queue < pair < pair < int ,int > , int > > all;
    all.push(make_pair(make_pair(0,0),1));
    all.push(make_pair(make_pair(0,0),0));
    can[N][M][0]=1;
    can[N][M][1]=1;
    while(!all.empty())
    {
        temp=all.front();
        all.pop();
        here=temp.first.first;
        what=temp.first.second;
        x=temp.second;
        if(here==N) continue;
        if(have[here][what][x]) continue;
        have[here][what][x]=1;
        if(x==how[here]) continue;
        if(x==0)
        {
            if(what==M) continue;
            t=here+c[what];
            if(t>N||what==M||How[t-1]-How[here]) continue;
            all.push(make_pair(make_pair(t,what+1),1));
        }
        else
        {
            all.push(make_pair(make_pair(here+1,what),0));
            all.push(make_pair(make_pair(here+1,what),1));
        }
    }

    for(here=N-1;here>=0;here--)
    {
        for(what=M;what>=0;what--)
        {
            for(x=0;x<2;x++)
            {
                if(x==how[here]||!have[here][what][x]) continue;
                if(x==0)
                {
                    if(what==M) continue;
                    t=here+c[what];
                    if(t>N||what==M||How[t-1]-How[here]) continue;
                    if(can[t][what+1][1])
                    {
                        can[here][what][0]|=1;
                        Can[0][here]|=1;
                        Big[here]=max(Big[here],t-1);
                    }
                }
                else
                {
                    can[here][what][1]|=can[here+1][what][0];
                    can[here][what][1]|=can[here+1][what][1];
                    Can[1][here]|=can[here][what][1];
                }
            }
        }
    }
}
string solve_puzzle(string s, vector < int > c)
{
    int i,j,big=-1;
    a=s;
    ::c=c;
    N=s.length(),M=c.size();
    for(i=0;i<N;i++)
    {
        if(i) How[i]=How[i-1];
        How[i]+=(s[i]=='_');
        Big[i]=-1;
        if(s[i]=='_') how[i]=0;
        else if(s[i]=='X') how[i]=1;
        else how[i]=2;
    }
    F2();
    for(i=0;i<N;i++)
    {
        for(j=max(big+1,i);j<=Big[i];j++) Can[0][j]=1;
        big=max(big,Big[i]);
    }
    for(i=0;i<N;i++)
    {
        if(Can[0][i]==0) s[i]='_';
        else if(Can[1][i]==0) s[i]='X';
        else s[i]='?';
    }
    return s;
}

• Subtask 1: 7 / 7
• Subtask 2: 3 / 3
• Subtask 3: 22 / 22
• Subtask 4: 27 / 27
• Subtask 5: 21 / 21
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10