foo.cc: In function 'int main()':
foo.cc:154:40: warning: unused variable 'c' [-Wunused-variable]
  154 |  int l[100010] = {0}, b[100010] = {0}, c[100010] = {0};
      |                                        ^
foo.cc:160:6: warning: unused variable 'k' [-Wunused-variable]
  160 |  int k = 0;
      |      ^

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