海南版本提交

pqs-common/common-core/src/main/java/com/njcn/common/utils/NjcnDateUtils.java

@@ -65,4 +65,33 @@ public class NjcnDateUtils {
         }
         return dates;
     }
+
+    public static void main(String[] args) {
+
+        System.out.println(NjcnDateUtils.longestCommonSubsequence("abcccccccb","acbaa"));
+
+    }
+    public static int longestCommonSubsequence(String s1, String s2) {
+        int n = s1.length(), m = s2.length();
+        s1 = " " + s1; s2 = " " + s2;
+        char[] cs1 = s1.toCharArray(), cs2 = s2.toCharArray();
+        int[][] f = new int[n + 1][m + 1];
+
+        // 因为有了追加的空格，我们有了显然的初始化值（以下两种初始化方式均可）
+        // for (int i = 0; i <= n; i++) Arrays.fill(f[i], 1);
+        for (int i = 0; i <= n; i++) f[i][0] = 1;
+        for (int j = 0; j <= m; j++) f[0][j] = 1;
+
+        for (int i = 1; i <= n; i++) {
+            for (int j = 1; j <= m; j++) {
+                if (cs1[i] == cs2[j]) {
+                    f[i][j] = f[i -1][j - 1] + 1;
+                } else {
+                    f[i][j] = Math.max(f[i - 1][j], f[i][j - 1]);
+                }
+            }
+        }
+        // 减去最开始追加的空格
+        return f[n][m] - 1;
+    }
 }