Compilare: user.c: In function ‘main’: user.c:37:33: warning: variable ‘cc’ set but not used [-Wunused-but-set-variable] int i, j, n, m, pl, pc, cl, cc, nl, nc; ^~ user.c:37:29: warning: variable ‘cl’ set but not used [-Wunused-but-set-variable] int i, j, n, m, pl, pc, cl, cc, nl, nc; ^~ user.c:40:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:41:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:43:5: warning: ignoring return value of ‘read’, declared with attribute warn_unused_result [-Wunused-result] read(STDIN_FILENO, buf, CHUNK); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:104:5: warning: ‘nc’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d", d[nl][nc]); ^~~~~~~~~~~~~~~~~~~~~~~ user.c:104:5: warning: ‘nl’ may be used uninitialized in this function [-Wmaybe-uninitialized]