Compilare: main.c: In function 'main': main.c:9:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("harta.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:10:6: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("harta.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:11:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^~~~~~~~~~~~~~~ main.c:13:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &v[i][0], &v[i][1]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~