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22 lines
471 B
22 lines
471 B
package cap4
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import "strings"
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// Ex27 最长公共子序列
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func Ex27(str1, str2 []rune) (int, string) {
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dp := _makeMatrix(len(str1)+1, len(str2)+1)
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subStr := strings.Builder{}
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for i := 1; i <= len(str1); i++ {
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for j := 1; j <= len(str2); j++ {
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a, b := str1[i], str2[j]
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if a == b {
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dp[i][j] = dp[i-1][j-1] + 1
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subStr.WriteRune(a)
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} else {
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dp[i][j] = max(dp[i-1][j], dp[i][j-1])
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}
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}
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}
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return dp[len(str1)][len(str2)], subStr.String()
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}
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