Can anyone help me with finding the the time complexity of the following algorithm??

for(i =0;i<n;i++)
for(j=o;j<n;j++)
for(k = a[j] = 0; k<n;k++)
a[j] += b[k] * c[k][j];


please!!!! and explain step by step .....

thanks for first link Salem.. and for the second too..

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