/in/foo.cc: In function 'int stuin()':
/in/foo.cc:14:54: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   14 |                 for(;j>=1&&(y>stu[j][1]||y==stu[j][1]&&z>stu[j][2]);j--)
      |                                          ~~~~~~~~~~~~^~~~~~~~~~~~~
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/12/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status