Compilare: main.c: In function 'main': main.c:15:10: warning: operation on 'n' may be undefined [-Wsequence-point] n^=m^=n^=m; ^~ main.c:13:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("aladdin2.in","r",stdin),freopen("aladdin2.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:13:38: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("aladdin2.in","r",stdin),freopen("aladdin2.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:13:73: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("aladdin2.in","r",stdin),freopen("aladdin2.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~