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Lỗi biên dịch:

Main.cc: In function ‘int main()’:
Main.cc:35:5: error: expected ‘,’ or ‘;’ before ‘printf’
     printf("%d",s));
     ^~~~~~
Main.cc:33:9: warning: unused variable ‘s’ [-Wunused-variable]
     int s=0
         ^
Main.cc:26:5: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     (void)scanf("%d",&n);
     ^~~~~~~~~~~~~~~~~~~~
Main.cc:27:5: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     (void)scanf("%d",&k);
     ^~~~~~~~~~~~~~~~~~~~
Main.cc:30:13: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
             (void)scanf("%d",&a[i]);
             ^~~~~~~~~~~~~~~~~~~~~~~