The online judge has results different from my computers'

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    Here's my code, use dynamic programming, when I submitted it, the oj told me that my program is wrong when the data is ["aa", "ab"], it said my program outputs true. However, when I ran it on my computer, it turned out to be false. Anyone has any ideas?

    bool isScramble(string s1, string s2) {
        if(s1.size()!=s2.size()) return false;
        int n=s1.size();
        bool dp[n+1][n+1][n+1];
        for(int i=0; i<n; i++)
            for(int j=0; j<n; j++)
                dp[1][i][j] = (s1[i]==s2[j]);
        for(int k=2; k<=n; k++){
            for(int i=0; i<n-k+1; i++){
                for(int j=0; j<n-k+1; j++) {
                    for(int l=1; l<k; l++) {
                        dp[k][i][j] = (dp[l][i][j]&&dp[k-l][i+k][j+k])||(dp[l][i][j+k-l]&&dp[k-l][i+k][j]);
        return dp[n][0][0];

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