Compilare: main.c: In function 'I': main.c:17:13: warning: unused variable 'b' [-Wunused-variable] int u,c,b=0; ^ main.c: In function 'main': main.c:41:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("zmeu2.in","r",stdin),freopen("zmeu2.out","w",stdout),scanf("%d%d%d",&n,&p,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:41:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("zmeu2.in","r",stdin),freopen("zmeu2.out","w",stdout),scanf("%d%d%d",&n,&p,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:41:67: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("zmeu2.in","r",stdin),freopen("zmeu2.out","w",stdout),scanf("%d%d%d",&n,&p,&k); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:43:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&t[1][i],&t[2][i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:55:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y),a[x][y]=0; ^~~~~~~~~~~~~~~~~~~