foo.cc: In function 'int main()':
foo.cc:104:13: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
  P = (P ^ n - 1) * V;
           ~~^~~
foo.cc:105:13: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
  Q = (Q ^ n - 1) * W;
           ~~^~~

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