2020.9.6晚腾讯后台笔试题
感谢大佬激发我做笔试题的欲望，本打算放弃，下午跟大佬讨论腾讯笔试一番后，下定决心决战腾讯笔试。一共A了4道，第二道耗费将近一个小时，导致最后一道连看题的时间都没有😭 贴一下1-4题都代码吧，虽然我是菜鸡，希望大佬们不要笑话😭
//1
#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> arr1;
vector<int> arr2;
int n, x;
cin >> n;
for (int i = 0; i < n; ++i) {
cin >> x;
arr1.push_back(x);
}
cin >> n;
for (int i = 0; i < n; ++i) {
cin >> x;
arr2.push_back(x);
}
int i = 0;
int j = 0;
while (i < arr1.size() && j < arr2.size()) {
if (arr1[i] == arr2[j]) {
cout << arr1[i] << " ";
++i;
++j;
}
else if (arr1[i] > arr2[j]) {
++i;
}
else {
++j;
}
}
return 0;
} //2
#include <iostream>
#include <set>
#include <map>
#include <vector>
#include <queue>
using namespace std;
int main() {
int n, m;
int x, num;
int index = 0;
cin >> n >> m;
set<int> res;
queue<int> vals;
vector<set<int>> elems; //组对应的元素
map<int, set<int>> ms; //元素所对应的组
for (int i = 0; i < m; ++i) {
cin >> x;
set<int> ts;
for (int j = 0; j < x; ++j) {
cin >> num;
ts.insert(num);
ms[num].insert(index);
}
elems.push_back(ts);
++index;
}
vals.push(0);
while (!vals.empty()) {
int size = vals.size();
for (int i = 0; i < size; ++i) {
int cur = vals.front();
vals.pop();
for (auto item : ms[cur]) {
for (auto item_ : elems[item]) {
if (res.find(item_) == res.end()) {
res.insert(item_);
vals.push(item_);
}
}
}
}
}
cout << res.size();
return 0;
} //3
#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
using namespace std;
struct Node {
string str;
int count;
Node(string &str) : str(str), count(1) {};
};
int main() {
int n, k;
int index = 0;
string str;
vector<Node> nodes;
map<string, int> indexs;
cin >> n >> k;
for (int i = 0; i < n; ++i) {
cin >> str;
if (indexs.find(str) == indexs.end()) {
indexs.insert({str, index++});
nodes.push_back(Node(str));
}
else {
nodes[indexs[str]].count++;
}
}
sort(nodes.begin(), nodes.end(), [](const Node &n1, const Node &n2) {
if (n1.count == n2.count) {
return n1.str < n2.str;
}
return n1.count > n2.count;
});
for (int i = 0; i < k; ++i) {
cout << nodes[i].str << " " << nodes[i].count << endl;
}
sort(nodes.begin(), nodes.end(), [](const Node &n1, const Node &n2) {
if (n1.count == n2.count) {
return n1.str < n2.str;
}
return n1.count < n2.count;
});
for (int i = 0; i < k; ++i) {
cout << nodes[i].str << " " << nodes[i].count << endl;
}
return 0;
} //4
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
int n;
int x;
int minIndex = -1;
vector<int> array;
vector<int> array_;
cin >> n;
minIndex = n / 2;
for (int i = 0; i < n; ++i) {
cin >> x;
array.push_back(x);
array_.push_back(x);
}
sort(array_.begin(), array_.end());
for (int i = 0; i < n; ++i) {
if (array[i] < array_[minIndex]) {
cout << array_[minIndex] << endl;
}
else {
cout << array_[minIndex - 1] << endl;
}
}
return 0;
} 
