三月份蓝桥杯刷题--3.9

[Persistence]

//星期计算
#include <iostream>
#include<vector>
using namespace std;
int main()
{
  cout<<7;
  // 对20的22次方对七取余可得到6的22次方，将6的22次方转换为36的11次方再对7取余可得1的11次方即为1。所以20的22次方取余7等于1，故结果等于6+1=7。
  return 0;
}

https://www.lanqiao.cn/problems/2140/learning/?page=2&first_category_id=1&sort=students_count&second_category_id=3&tags=2022

//考勤刷卡
#include <iostream>
#include<algorithm>
using namespace std;
int id[110];
int main()
{
  int n;
  cin>>n;
  for(int i=0;i<n;i++)
  {
    string s;
    cin>>s>>id[i];
  }
  sort(id,id+n);
  for(int i=0;i<n;i++)
  if(id[i]!=id[i+1]) cout<<id[i]<<endl;
  return 0;
}

https://www.lanqiao.cn/problems/2380/learning/?page=1&first_category_id=1&sort=students_count&second_category_id=3&tags=2022

//卡片
#include <iostream>
using namespace std;
int main()
{
  int n;
  cin>>n;
  for(int i=2;;i++)
  {
    if(i*(i+1)/2>=n){
      printf("%d",i);
      break;
    }
  }
  return 0;
}

https://www.lanqiao.cn/problems/2383/learning/?page=2&first_category_id=1&sort=students_count&second_category_id=3&tags=2022