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vector<int> vc(100);
printf("%d\n",vc.capacity()); // 100
vc.push_back(1); // 增长了
vc.push_back(2);
printf("%d\n",vc.capacity()); // 150
vc.clear();
printf("%d\n",vc.capacity()); // 150
vector<int> vc(100);
vc.push_back(1);
vc.push_back(2);
printf("%d\n",vc.capacity());
vc.clear();
printf("%d\n",vc.capacity());