quality.cpp: In function 'int main(int, char**)':
quality.cpp:19:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
19 | scanf("%d%d%d%d",&n,&m,&h,&w);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
quality.cpp:22:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
22 | scanf("%d",&a[i][j]);
| ~~~~~^~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccYubE1h.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccezkAlj.o:quality.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccYubE1h.o: in function `main':
grader.cpp:(.text.startup+0xe9): undefined reference to `rectangle(int, int, int, int, int (*) [3001])'
collect2: error: ld returned 1 exit status