foo.cc: In function 'int main()':
foo.cc:11:61: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   11 |                         if(a[j][3]<a[i][3]||a[j][3]==a[i][3]&&a[j][1]<a[i][1])
      |                                             ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
foo.cc:18:23: error: unable to find string literal operator 'operator""a' with 'const char [4]', 'long unsigned int' arguments
   18 |                 cout<<"   "a[i][1]<<"   "a[i][2]<<"   "a[i][3]<<endl;
      |                       ^~~~~~
foo.cc:18:37: error: unable to find string literal operator 'operator""a' with 'const char [4]', 'long unsigned int' arguments
   18 |                 cout<<"   "a[i][1]<<"   "a[i][2]<<"   "a[i][3]<<endl;
      |                                     ^~~~~~
foo.cc:18:51: error: unable to find string literal operator 'operator""a' with 'const char [4]', 'long unsigned int' arguments
   18 |                 cout<<"   "a[i][1]<<"   "a[i][2]<<"   "a[i][3]<<endl;
      |                                                   ^~~~~~

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