白皮 Chapter 2

7.2 做题一遍就过的感觉简直太美好啦~然而我并没有测试数据QAQ

//program name digit
#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
    int a,count=0;
    cin>>a;
    while (a>0){
        a=a/10;
        count++;
    }
    cout<<count;
    return 0;
}

//program name daffodil
#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
    int a,b,c;
    for (a=1;a<=9;a++)
        for (b=0;b<=9;b++)
            for (c=0;c<=9;c++)
                if (a*a*a+b*b*b+c*c*c==100*a+10*b+c) cout<<100*a+10*b+c<<"
";
    return 0;
}

//program name hanxin
#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
    int a,b,c,i;
    cin>>a>>b>>c;
    for (i=10;i<=100;i++)
        if (i % 3==a && i % 5==b && i % 7==c)
        {
            cout<<i<<"
";
            break;
        }
    if (i==101) cout<<"No answer";
    return 0;
}

//program name triangle
#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
    int n,i,j;
    cin>>n;
    for (i=1;i<=n;i++)
    {
        for (j=1;j<=i-1;j++) cout<<" ";
        for (j=1;j<=2*(n-i)+1;j++) cout<<"#";
        cout<<"
";
    }
    return 0;
}

7.3 要坚持练语法打下扎实基础啊~