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程式語言 - LeetCode - C++ - 97. Interleaving String

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題目：


解答：

class Solution {
public:
    bool isInterleave(string s1, string s2, string s3) {
        int m = s1.size();
        int n = s2.size();
        vector<vector<bool>> dp(m + 1, vector<bool>(n + 1, false));

        if (m + n != s3.size()) {
            return false;
        }

        dp[0][0] = true;
        for (int i = 1; i <= m; ++i) {
            dp[i][0] = dp[i - 1][0] && (s1[i - 1] == s3[i - 1]);
        }

        for (int i = 1; i <= n; ++i) {
            dp[0][i] = dp[0][i - 1] && (s2[i - 1] == s3[i - 1]);
        }

        for (int i = 1; i <= m; ++i) {
            for (int j = 1; j <= n; ++j) {
                dp[i][j] = (
                    dp[i - 1][j] && s1[i - 1] == s3[i + j - 1] ||
                    dp[i][j - 1] && s2[j - 1] == s3[i + j - 1]
                );
            }
        }

        return dp[m][n];
    }
};