Compilare: main.c: In function 'main': main.c:19:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(!v[g[i][j]]) ^ main.c:7:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in","r",stdin),freopen("bellmanford.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:41: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in","r",stdin),freopen("bellmanford.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:79: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in","r",stdin),freopen("bellmanford.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~ main.c:9:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",a+i,b+i,c+i),w[a[i]]++; ^~~~~~~~~~~~~~~~~~~~~~~~~~~