asawa_harsh's blog

Unable to solve Atcoder ABC237 Problem F

By asawa_harsh, history, 4 years ago, In English

Can anyone tell me the dp transitions for this problem ? Even after seeing the editorial I am not able to code.

Problem link

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4 years ago, hide # |
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we will assume fir, sec, and third are three elements in lis array and fir<=sec<=third. now we'll assume x be the next element, then we'll check which element it replace fir, sec, third or none. you can look at this for reference. Link

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    4 years ago, hide # ^ |
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    Thanks ! Can u explain base case in your code ? I wrote this as base case but not getting correct output of samples.

    for (int i = 1; i <= m; i++) {

    for (int j = i + 1; j <= m; j++) {

      for (int k = j + 1; k <= m; k++) {

                dp[3][i][j][k] = 1; // Base Case

       }

 }

    }

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      4 years ago, hide # ^ |
       
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      I wrote dp[0][m + 1][m + 1][m + 1] = 1 as my base case because initially there will be no elements in lis array and i took m+1 so that all subsequent elements will be less than it so can be instantly inserted in lis array.

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