Compilare: main.c: In function 'main': main.c:39:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.in","r",stdin),freopen("lanterna.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:39:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.in","r",stdin),freopen("lanterna.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:39:70: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.in","r",stdin),freopen("lanterna.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~ main.c:41:7: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",e+i); ^~~~~~~~~~~~~~~ main.c:42:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^~~~~~~~~~~~~~ main.c:47:7: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),scanf("%d%d",&t[i][j],&w[i][j]),t[j][i]=t[i][j],w[j][i]=w[i][j]; ^~~~~~~~~~~~~~~~~~~ main.c:47:27: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),scanf("%d%d",&t[i][j],&w[i][j]),t[j][i]=t[i][j],w[j][i]=w[i][j]; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~