Eroare de compilare: user.c: In function ‘main’: user.c:15:9: error: ‘x’ undeclared (first use in this function) x+=e[f[k][j]]; ^ user.c:15:9: note: each undeclared identifier is reported only once for each function it appears in user.c:4:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("numere6.in","r",stdin),freopen("numere6.out","w",stdout),scanf("%d%d",&a,&b); ^ user.c:4:44: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("numere6.in","r",stdin),freopen("numere6.out","w",stdout),scanf("%d%d",&a,&b); ^ user.c:4:76: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("numere6.in","r",stdin),freopen("numere6.out","w",stdout),scanf("%d%d",&a,&b); ^