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Main.cc: In function ‘int main()’:
Main.cc:7:22: error: storage size of ‘a’ isn’t known
     int N,dem=0;char a[];scanf("%d",&N);
                      ^
Main.cc:7:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     int N,dem=0;char a[];scanf("%d",&N);
                          ~~~~~^~~~~~~~~