very very base question

[mickey]

Hello, I have this simple doubt: what's the code more properly?And Why?(my question is on the vector "vec") thanks.

string str;
while(file.getline(str)) {
  vector<int> vec;
  ..................
  while (parseStr) {
      vec.push_back(numberContainedInStr);
  }
  otherVector.push_back(vec);
}

string str;
while(file.getline(str)) {
  vector<int> vec;
  ..................
  while (parseStr) {
      vec.push_back(numberContainedInStr);
  }
  otherVector.push_back(vec);
}

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or

string str;
vector<int> vec;
while(file.getline(str)) {
  ..................
  while (parseStr) {
      vec.push_back(numberContainedInStr);
  }
  otherVector.push_back(vec);
  vec.clear();
}

string str;
vector<int> vec;
while(file.getline(str)) {
  ..................
  while (parseStr) {
      vec.push_back(numberContainedInStr);
  }
  otherVector.push_back(vec);
  vec.clear();
}

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