Compilare: main.c: In function 'main': main.c:38:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("ex.in","r",stdin),freopen("ex.out","w",stdout),scanf("%d%d%d",&n,&k,&p),r=p-k,s[1][1][1]=s[1][1][0]=c[0][0]=c[0][1]=y[0][1]=y[0][0]=1; ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:38:32: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("ex.in","r",stdin),freopen("ex.out","w",stdout),scanf("%d%d%d",&n,&k,&p),r=p-k,s[1][1][1]=s[1][1][0]=c[0][0]=c[0][1]=y[0][1]=y[0][0]=1; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:38:61: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("ex.in","r",stdin),freopen("ex.out","w",stdout),scanf("%d%d%d",&n,&k,&p),r=p-k,s[1][1][1]=s[1][1][0]=c[0][0]=c[0][1]=y[0][1]=y[0][0]=1; ^~~~~~~~~~~~~~~~~~~~~~~~