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View Compilation Error

0_0_35405027_20447.cpp:9:8: error: storage size of 'a' isn't known
  int a[];
        ^
0_0_35405027_20447.cpp: In function 'int main()':
0_0_35405027_20447.cpp:11:16: error: expected primary-expression before ',' token
      int t,cas=,n;
                ^
0_0_35405027_20447.cpp:14:22: error: 'n' was not declared in this scope
          scanf("%d",&n);
                      ^
0_0_35405027_20447.cpp:15:22: error: expected primary-expression before ';' token
          for (int i= ; i<n ; i++)
                      ^
0_0_35405027_20447.cpp:17:24: error: expected primary-expression before ';' token
          long long ans=;
                        ^
0_0_35405027_20447.cpp:18:23: error: expected primary-expression before ']' token
          double b=a[n-]-a[n-];
                       ^
0_0_35405027_20447.cpp:18:29: error: expected primary-expression before ']' token
          double b=a[n-]-a[n-];
                             ^
0_0_35405027_20447.cpp:19:24: error: expected primary-expression before ';' token
          for (int i=n- ; i>= ; i--) {
                        ^
0_0_35405027_20447.cpp:19:30: error: expected primary-expression before ';' token
          for (int i=n- ; i>= ; i--) {
                              ^
0_0_35405027_20447.cpp:20:37: error: expected primary-expression before ']' token
              double  temp=(a[i]-a[i-])*1.0;
                                     ^
0_0_35405027_20447.cpp:25:28: error: expected primary-expression before ')' token
                  b=temp/(t+);
                            ^
0_0_35405027_20447.cpp:30:6: error: return-statement with no value, in function returning 'int' [-fpermissive]
      return ;
      ^


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