这是LeetCode1143
1143. 最长公共子序列 - 力扣(LeetCode)
为什么上面代码比下面代码快
class Solution {
public int longestCommonSubsequence(String text1, String text2) {
try{
Callable<Integer> func = () -> help(text1,text2);
FutureTask<Integer> response = new FutureTask<>(func);
new Thread(response).start();
return response.get();
}catch(Exception e){}
return 0;
}
public int help(String text1, String text2) {
int m = text1.length();
int n = text2.length();
int[][] dp = new int[m+1][n+1];
for (int i=1;i<=m;i++){
for (int j=1;j<=n;j++){
if (text1.charAt(i-1)==text2.charAt(j-1)){
dp[i][j] = dp[i-1][j-1]+1;
}else{
dp[i][j] = Math.max(dp[i][j-1], dp[i-1][j]);
}
}
}
return dp[m][n];
}
}
class Solution {
public int longestCommonSubsequence(String text1, String text2) {
int m = text1.length(), n = text2.length();
int[][] dp = new int[m + 1][n + 1];
for(int i=1;i<=m;i++){
char c1 = text1.charAt(i - 1);
for(int j=1;j<=n;j++){
char c2 = text2.charAt(j - 1);
if(c1 == c2)
dp[i][j] = dp[i - 1][j - 1] + 1;
else {
dp[i][j] = Math.max(dp[i - 1][j], dp[i][j - 1]);
}
}
}
return dp[m][n];
}
}