Compilare: user.c: In function ‘main’: user.c:8:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:9:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:11:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &m, &n); ^~~~~~~~~~~~~~~~~~~~~~ user.c:13:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^~~~~~~~~~~~~~~~~~ user.c:15:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b[i]); ^~~~~~~~~~~~~~~~~~ user.c:28:13: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] max = k = din[i][j]; ~~^~~~~~~~~~~