/in/foo.cc: In function 'void check(int, int, int, int)':
/in/foo.cc:20:19: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
     if(x<1||x>n||y<1|y>m)
                  ~^~
/tmp/ccNCgLdH.o: In function `_GLOBAL__sub_I_d':
foo.cc:(.text.startup+0x2d3): relocation truncated to fit: R_X86_64_PC32 against `.bss'
foo.cc:(.text.startup+0x2f1): relocation truncated to fit: R_X86_64_PC32 against `.bss'
collect2: error: ld returned 1 exit status