Ｃ言語なら俺に聞け（入門篇） Part 21

593 名前：デフォルトの名無しさん [2007/11/22(木) 15:05:40 ] 計ってみたよ　配列に何度も入れた方がわずかに速いようだ #include <iostream> #include <time.h> #define N 900000 using namespace std; main(){ unsigned int n,k,c,sum; unsigned int *x,*y,*z,*v,*w; x=new unsigned int [N]; y=new unsigned int [N]; z=new unsigned int [N]; v=new unsigned int [N]; w=new unsigned int [N]; for(n=0;n<N;n++){x[n]=rand()%10;y[n]=rand()%N;z[n]=rand()%N;v[n]=rand()%N;w[n]=rand()%N;} sum=0; c=clock(); for(n=0;n<N;n++){k=w[n];k=v[k];k=z[k];k=y[k];sum+=x[k];} c=clock()-c; cout<<c<<" clock "<<sum<<endl; sum=0; c=clock(); for(n=0;n<N;n++)sum+=x[y[z[v[w[n]]]]]; c=clock()-c; cout<<c<<" clock "<<sum<<endl; }

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