bank.cpp: In function 'int main()':
bank.cpp:14:8: warning: unused variable 's' [-Wunused-variable]
     ll s;
        ^
bank.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~
bank.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &a[i]);
         ~~~~~^~~~~~~~~~~~~~~
bank.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &b[i]);
         ~~~~~^~~~~~~~~~~~~~~