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View Compilation Error

660683_0_0_1542\Main.java:20: 需要数组,但找到 java.lang.String
            if(x[i]==y[j]) c[i][j]=c[i-1][j-1]+1;
                ^
660683_0_0_1542\Main.java:20: 需要数组,但找到 java.lang.String
            if(x[i]==y[j]) c[i][j]=c[i-1][j-1]+1;
                      ^
660683_0_0_1542\Main.java:25: 已在 main(java.lang.String[]) 中定义 x
  String x=cin.next();
         ^
660683_0_0_1542\Main.java:26: 已在 main(java.lang.String[]) 中定义 y
  String y=cin.next();
         ^
4 错误


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