quality.cpp: In function 'int main()':
quality.cpp:28:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
28 | scanf("%d%d%d%d", &r, &c, &h, &w);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
quality.cpp:33:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
33 | scanf("%d", &a[i][j]);
| ~~~~~^~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccXB3GYK.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc2rxpnL.o:quality.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccXB3GYK.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