Submission #102841

#	Time	Username	Problem	Language	Result	Execution time	Memory
102841		daniel920712	Paint By Numbers (IOI16_paint)	C++14	90 / 100	2059 ms	94968 KiB

paint

#include <iostream>
#include <stdio.h>
#include <vector>
#include <utility>
#include "paint.h"
using namespace std;
bool Can[2][200005]={0};
int N,M,ans=0;
bool have[200005][105][2]={0};
bool can[200005][105][2]={0};
int How[200005]={0};
int now=1;
int Big[200005];
string a;
vector < int > c;
int F(int here,int what,int x)
{
    //printf("%d %d %d\n",here,what,x);
    int A,b,i,t;
    if(have[here][what][x]) return can[here][what][x];
    else if(here==N) return what==M;
    else
    {
        if(x==0&&a[here]=='_'||x==1&&a[here]=='X') return 0;
        if(x==0)
        {
            t=here+c[what];
            have[here][what][x]=1;
            if(t>N) return 0;
            if(what==M) return 0;
            if(How[t-1]-How[here]) return 0;
            if(F(t,what+1,1))
            {
                can[here][what][x]=1;
                Can[x][here]=1;
                Big[here]=max(Big[here],t-1);
            }
            /*A=F(t,what+1,1);
            can[here][what][x]=A;
            if(A)
            {
                //printf("%d %d %d\n",here,what,A);
                Big[here]=max(Big[here],t-1);
            }*/

        }
        else
        {
            have[here][what][x]=1;
            can[here][what][x]=F(here+1,what,0);
            can[here][what][x]|=F(here+1,what,1);
            //Can[x][here]=can[here][what][x]||Can[x][here];
            /*A=F(here+1,what,0);
            b=F(here+1,what,1);
            can[here][what][x]=A||b;*/

            Can[x][here]|=can[here][what][x];
            //printf("%d %d %d %d\n",here,what,can[here][what][x],Can[x][here]);
        }
    }

    return can[here][what][x];
}
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;
    }
    F(0,0,0);
    F(0,0,1);
    for(i=0;i<N;i++)
    {
        //printf("%d ",Big[i]);
        for(j=max(big,i);j<=max(big,Big[i]);j++) Can[0][j]=1;
        big=max(big,Big[i]);
    }
    //printf("\n");
    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;
}

Compilation message (stderr)

paint.cpp: In function 'int F(int, int, int)':
paint.cpp:24:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(x==0&&a[here]=='_'||x==1&&a[here]=='X') return 0;
            ~~~~^~~~~~~~~~~~~~
paint.cpp:19:9: warning: unused variable 'A' [-Wunused-variable]
     int A,b,i,t;
         ^
paint.cpp:19:11: warning: unused variable 'b' [-Wunused-variable]
     int A,b,i,t;
           ^
paint.cpp:19:13: warning: unused variable 'i' [-Wunused-variable]
     int A,b,i,t;
             ^

• 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: 0 / 10