Compilare: user.c: In function ‘main’: user.c:14:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("potrivire.in", "r", stdin); ^ user.c:15:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("potrivire.out", "w", stdout); ^ user.c:17:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hu %hu %s ", &n, &m, t + 1); ^