TOJ2706.FactoringaPolynomial给一个多项式的系数,判断这个多项式是否能够在实数范围内分解.定理:对于n次多项(1)如果n2,可分解(3)如果n=2,判断判别式就可以了.即b*b-4*a*cCode:#includeintmain(){inti,j,n,a[22];while(scanf("%d",&n)!=EOF){for(i=n;i>=0;i--)scanf("%d",&a[i]);if(n2)printf("NOn");elseif(n==2){if(a[1]*a[1]>=4*a[2]*a[0])printf("NOn");elseprintf("YESn");}}return0;}