foo.cc: In function 'int main()':
foo.cc:88:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",s+1);
         ~~~~~^~~~~~~~~~
foo.cc:94:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",t+1); ull res=1;
         ~~~~~^~~~~~~~~~

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