由浅入深

P8717 [蓝桥杯 2020 省 AB2] 成绩分析

#include <iostream>
using namespace std;
int num;
double sum;
int maxs,mins;
int n;int main()
{mins=1e9;maxs=-1e9;sum=0;cin>>n;for(int i=0;i<n;i++){cin>>num;sum+=num;maxs=max(maxs,num);mins=min(mins,num);}cout<<maxs<<endl;cout<<mins<<endl; printf("%.2lf",sum/n);return 0;
}

P8761 [蓝桥杯 2021 国 BC] 大写

直接用ASCII数的性质，记得要char强转一下

#include <iostream>
#include <cstring>
using namespace std;int main()
{string s;cin>>s;for(int i=0;i<(int)s.size();i++){if(s[i]>='a'&&s[i]<='z') cout<<char(s[i]+'A'-'a');else cout<<s[i];}return 0;
}

P8711 [蓝桥杯 2020 省 B1] 整除序列

#include <iostream>
using namespace std;
long long n;int main()
{cin>>n;while(n>=1){cout<<n<<" "; n/=2;}return 0;
}

P8722 [蓝桥杯 2020 省 AB3] 日期识别

用map容器1把字符和数字对应

#include <iostream>
#include <map>
#include <string>
using namespace std;
map<string,int> si;
string s;int main()
{cin>>s;string s1=s.substr(0,3);string Jan1="Jan",Feb1="Feb",Mar1="Mar",Apr1="Apr",May1="May",Jun1="Jun",Jul1="Jul",Aug1="Aug",Sep1="Sep",Oct1="Oct",Nov1="Nov",Dec1="Dec";si[Jan1]=1,si[Feb1]=2,si[Mar1]=3,si[Apr1]=4,si[May1]=5;si[Jun1]=6,si[Jul1]=7,si[Aug1]=8,si[Sep1]=9,si[Oct1]=10,si[Nov1]=11,si[Dec1]=12;cout<<si[s1]<<" ";if(s[3]!='0') cout<<s[3]; cout<<s[4];return 0;
}

P8680 [蓝桥杯 2019 省 B] 特别数的和

#include <iostream>
using namespace std;
int n;
int sum;
int flag;int main()
{cin>>n;for(int i=1;i<=n;i++){int a=i;while(a>0){int b=a%10;if(b==2||b==0||b==1||b==9){sum+=i;break;}a/=10;}}cout<<sum<<endl;return 0;
}