What are the running times of the following four loops? Briefly justify your answers. (in all cases, assume that n is sufficiently large if it needs to be assumed for the problem to make sense).   1) for (int i = 0; i < n*n; i++) { sum += i; }       2) for (int i = 0; i*i < n; i++) {      sum += i; }     3) for (int i = n*n; i > 1; i /= 2) {      if (i > 16) {            sum += i;      } }     4) for (int i = 0; i < n; i++) {      for (int j = 0; j < n; j++) {            for (int k = j+1; k < n; k++) {                 sum += i*j*k;

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