foo.cc: In function 'int main()':
foo.cc:28:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   for (int j=0; j<a[t[i]].size(); j++) {
      |                 ~^~~~~~~~~~~~~~~

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Found 10 testcases.
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