选主元的Doolittle分解法程序 #include#include#include#definen3intmain(){inti,j,k,row,v,t;intM[n];floatm,r,max0,max1;floata[n][n],b[n],s[n],l[n][n],u[n][n],x[n],y[n];a[0][0]=0.5,a[