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#include <iostream> #include<vector> using namespace std; int main() { vector<vector<int>> logs{{0, 0}, {1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}}; for (auto beg = logs.begin(); beg != logs.end(); beg++) { cout << (*beg)[0] << endl; } return 0; }

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