新手刷杭电-A-2019~2025

杭电2019

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <climits>
#include <stdio.h>
#include <string.h>
#include <list>

using namespace std;

int main()
{
    list<int> a;
    int n,m,t;
    while(cin >> n >> m && (n!=0||m!=0))
    {
        a.clear();
        while(n--)
        {
            cin>>t;
            a.push_back(t);
        }
        a.push_back(m);
        a.sort();
        for(list<int>::iterator it = a.begin();it!=a.end();++it)
        {
            cout << *it;
            advance(it,1);
            if (it!=a.end()) cout << ' ';
            else cout << endl;
            advance(it,-1);
        }
    }

    return 0;
}

用了STL，很方便啊。。完全不用动脑子。。前18道题做的时候没保存，都没了。

 

2020

#include <iostream>
#include <cstdlib>
#include <cmath>
#include <iomanip>
#include <climits>
#include <stdio.h>
#include <string.h>
using namespace std;

int main()
{
    int n,a[105];
    while(cin>>n&&n)
    {
        int i = 0;
        while(i<n) cin >> a[i++];
            for(int j=n-1; j>0; --j)
            for(int k=0; k<j; ++k)
            {
                if (abs(a[k]) < abs(a[k+1])){
                    swap(a[k],a[k+1]);
                }

            }
            i = 0;
            while(i<n-1)
            cout << a[i++] << ' ';
            cout << a[n-1] << endl;

    }
    return 0;
}

 2021

#include <iostream>
#include <cstdlib>
#include <cmath>
#include <iomanip>
#include <climits>
#include <stdio.h>
#include <string.h>
using namespace std;

int main()
{
    int n,sum,money,a[6]={100,50,10,5,2,1};
    while(cin>>n&&n)
    {
        sum = 0;
            while(n--)
            {
                cin >> money;
                for(int i = 0; i<6; ++i)
                {
                    sum += money/a[i];
                    money %= a[i];
                }
            }
            cout << sum << endl;
    }
    return 0;
}

 2022

#include <iostream>
#include <cmath>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
using namespace std;

int main()
{
    int n,m,x,y,s;
    int a[100][100];
    while(cin>>n>>m)
    {
        x=0;
        y=0;
        for(int i=0;i<n;++i)
            for(int j=0;j<m;++j)
        {
            cin >> a[i][j];
        }
        for(int i=0;i<n;++i)
            for(int j=0;j<m;++j)
        {
            if(abs(a[x][y])<abs(a[i][j])){
               x=i;
               y=j;
               s=a[i][j];
               }
        }
        cout << x+1 << ' ' << y+1 << ' ' << s << endl;
    }
    return 0;
}

 2023

#include <iostream>
#include <cmath>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iomanip>
using namespace std;


int main()
{
    int n,m,a[50][5],sum,flag;
    double classaverage[5],studentaverage[50];
    while(cin >> n >> m)
    {
        memset(classaverage,0,sizeof(classaverage));
        memset(studentaverage,0,sizeof(studentaverage));
        sum = 0;
        for(int i=0;i<n;++i)
        for(int j=0;j<m;++j){
            cin >> a[i][j];
            classaverage[j] += a[i][j];
            studentaverage[i] += a[i][j];
        }
        for(int i=0;i<n-1;++i)
            cout <<  fixed << setprecision(2) <<studentaverage[i]/m << ' ';
        cout << fixed << setprecision(2) << studentaverage[n-1]/m << endl;
        for(int i=0;i<m-1;++i)
            cout << fixed << setprecision(2) << classaverage[i]/n << ' ';
        cout << fixed << setprecision(2) << classaverage[m-1]/n << endl;
        for(int i=0;i<n;++i){
            flag=1;
            for(int j=0;j<m;++j)
            if(a[i][j] < (classaverage[j]/n)) flag = 0;
            if(flag) sum++;
        }
        cout << sum << endl << endl;
    }

    return 0;
}

 

2024

#include <iostream>
#include <cmath>
#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include <iomanip>
using namespace std;


int main()
{
    int n,flag;
    char a[50];
    while(cin >> n)
    {
        memset(a,0,50);
        getchar();
        while(n--)
        {
            flag=1;
            gets(a);
            int i = strlen(a);
            while(i--)
                if(!((a[i]>='a' && a[i]<='z')||(a[i]>='A' && a[i]<='Z')|| a[i]=='_' || (a[i]>='0' && a[i]<='9'))) flag =0;
            if(!((a[0]>='a' && a[0]<='z')||(a[0]>='A' && a[0]<='Z')|| a[0]=='_')) flag = 0;
            puts(flag?"yes":"no");
        }

    }

    return 0;
}