quality.cpp: In function 'int main()':
quality.cpp:42:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
42 | scanf("%d %d %d %d", &r, &c, &h, &w);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
quality.cpp:46:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
46 | scanf("%d", &a[i][j]);
| ~~~~~^~~~~~~~~~~~~~~~
/tmp/ccgqMfjf.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccRgphxX.o:quality.cpp:(.text.startup+0x0): first defined here
/tmp/ccgqMfjf.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