期中编程考试参考答案

#include <iostream>
#include <iomanip>
using namespace std;
int main(){
    // n是短信条数
    int n;
    // words用于记录一条短信的数目
    int words;
    // money是短信总资费
    double cost = 0.0;

    // 输入短信总条数
    cin >> n;
    // 处理每条短信
    for (int i = 0; i < n; i++){
        cin >> words;
        if(words % 70 !=0)
            cost += words/ 70 * 0.1+0.1;
        else
            cost +=words / 70 * 0.1;
    }
    cout << fixed << setprecision(1) << cost << endl;

    return 0;
}

#include <iostream>
using namespace std;

int main(){
    
    //n是输入的数字个数，n<=100
    int n;
    //a记录输入的数字
    int a[100];
    //max记录最大数
    int max = 0;
    //sum记录除去最大数之后的数字之和
    int sum = 0;    
    int i = 0;
    cin >> n;

    // 输入并找出最大数
    for (i = 0; i < n; i++){
        cin >> a[i];
        if (a[i] > max)
            max = a[i];            
        
    }
    // 求最大数以外的和
    for (i = 0; i < n; i++) {
        if (a[i] != max)
            sum += a[i];       
        
    }
    // 输出
    cout << sum;
    
    return 0;
}

#include <iostream>
using namespace std;

int main() {
    int n;
    while(cin >> n) {
        if(n % 3 == 0) {
            cout << 3 << " ";
        }
        if(n % 5 == 0) {
            cout << 5 << " ";
        }
        if(n % 7 == 0) {
            cout << 7 << " ";
        }
        if(n%3!=0 && n%5!=0 && n%7!=0) {
            cout << "n";
        }
        cout << endl;
    }

    return 0;
}

#include <iostream>
using namespace std;
int main(){

    // 组数
    int num;
    cin >> num;

    // 记录鸡尾酒疗法的总人数、有效人数
    double totalCock, positiveCock;
    double ratioCock;
    cin >> totalCock >> positiveCock;
    if(totalCock > 0 && positiveCock > 0 && totalCock > positiveCock){

        ratioCock = (positiveCock / totalCock) * 100;
    
           // cout << ratioCock;
         // 处理n-1个数据

        num = num -1;
  
         for(int i = 0; i < num; i++){
            double tmpTotal = 0, tmpPositive = 0;
            cin >> tmpTotal >> tmpPositive;
            if((tmpTotal > tmpPositive )&& (tmpTotal > 0) && (tmpPositive > 0)){

                double tmpRatio = (tmpPositive / tmpTotal) * 100;

                if (tmpRatio-ratioCock  > 5){
                    cout << "better" << endl;
                }
                 else if (ratioCock - 5 > tmpRatio ){
                      cout << "worse" << endl;
                 }
                 else{
                  cout << "same" << endl;
                 }
            }
            else{
                cout << endl;
                continue;
            }
        }    
    }
    return 0;
}

#include <iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main(){
    // 所有点的X,Y坐标。假设最多有100个点
    double X[100], Y[100];
    // 记录最大的距离平方
    double maxDisSquare = 0;
    // 点的数量
    int num;
    cin >> num;
    for (int i = 0; i < num; i++){
        cin >> X[i] >> Y[i];
        // 比较与已有的点的距离
        for (int j = 0; j < i; j++){
            double DisSquare = pow(X[j]-X[i],2)+pow(Y[j]-Y[i],2);
            if (maxDisSquare < DisSquare) maxDisSquare = DisSquare;
        }
    }
    cout << fixed << setprecision(4) << sqrt(maxDisSquare) << endl;
    return 0;
}

#include<iostream>
using namespace std;
int main(){
    // 上限
    int limit;
    cin >> limit;
    
    for(int a = 2; a <= limit; a++){
        for(int b = 2; b < a; b++)
            for(int c = b; c < a; c++)
                for(int d = c; d < a; d++){
                    if(a * a * a == b * b * b + c * c * c + d * d * d)
                        cout << "Cube = " << a << ", Triple = ("
                             << b << "," << c << "," << d << ")" << endl;
                }
    }
    return 0;
}

#include <iostream>
using namespace std;

int main(){

    bool is = true;
    int num;
    cin >> num;

    if (num == 1) {
        cout << "no" << endl;
        return 0;
    }
    for (int i = 2; i < num; i++) {
        if (num % i == 0){
            is = false;
            break;
        }
    }
    cout << ((is)?"yes":"no") << endl;

    return 0;
}

#include<iostream>
#include<cstring>
using namespace std;
int main(){
    // 组数
    int group;
    cin >> group;
    // 字符串
    char str[1001];
    
    // 不断地输入并处理每组数据
    for(int iG = 0; iG < group; iG++){
        cin >> str;
        int cnt[27] = {0};
        for(int i = 0; i < strlen(str); i++){
            // 计数并累计至cnt数组中
                cnt[str[i]-‘a‘]++;
        }
        
        // 找出出现最多的字母及其数量
        int mostAlphabetIdx = 0;
        int maxCnt = 0;
        for (int i=0; i<26; i++) {
            if (cnt[mostAlphabetIdx] < cnt[i]) {
                
                mostAlphabetIdx = i;
            }
        }
        maxCnt = cnt[mostAlphabetIdx];
        
        cout << (char) (‘a‘ + mostAlphabetIdx)
        << " " << maxCnt << endl;
    }
    return 0;
}