Accepted
foo.cc: In function 'int main()':
foo.cc:45:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&k);
~~~~~^~~~~~~~~~~~~~
foo.cc:49:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%s%d%d",op + 1,&u,&v);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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