C++奥赛一本通刷题记录(排序)

2017.11.16 By gwj1139177410

都是拿STL水的...别怪我......

1. 谁考了第k名 openjudge01

   #include<iostream>
   #include<algorithm>
   using namespace std;
   const int maxn = 110;
   struct node{ int id;  float score; }a[maxn];
   int cmp(node a, node b){ return a.score==b.score?a.id<b.id:a.score>b.score; }
   int main(){
      int n, k;  cin>>n>>k;
      for(int i = 0; i < n; i++)cin>>a[i].id>>a[i].score;
      sort(a,a+n,cmp);
      cout<<a[k-1].id<<" "<<a[k-1].score<<"\n";
      return 0;
   }
   

2. 奇数单增序列 openjudge02

   #include<iostream>
   #include<algorithm>
   using namespace std;
   const int maxn = 550;
   int n, a[maxn];
   int main(){
      int t;  cin>>t;
      while(t--){
          cin>>a[n];
          if(a[n]%2==1)n++;
      }
      sort(a,a+n);
      for(int i = 0; i < n-1; i++)cout<<a[i]<<",";
      cout<<a[n-1]<<"\n";
      return 0;
   }
   

3. 成绩排序 openjudge03

   #include<iostream>
   #include<algorithm>
   #include<string>
   using namespace std;
   const int maxn = 110;
   struct node{ string name;  int score; }a[maxn];
   int cmp(node a, node b){ return a.score==b.score?a.name<b.name:a.score>b.score; }
   int main(){
      int n;  cin>>n;
      for(int i = 0; i < n; i++)cin>>a[i].name>>a[i].score;
      sort(a,a+n,cmp);
      for(int i = 0; i < n; i++)cout<<a[i].name<<" "<<a[i].score<<"\n";
      return 0;
   }
   

4. 奖学金 openjudge04

   #include<iostream>
   #include<algorithm>
   #include<string>
   using namespace std;
   const int maxn = 310;
   struct node{ int id, score, chinese; }a[maxn];
   int cmp(node a, node b){
       if(a.score != b.score)return a.score>b.score;
       if(a.chinese != b.chinese)return a.chinese>b.chinese;
       return a.id<b.id;
   }
   int main(){
      int n;  cin>>n;
      for(int i = 0; i < n; i++){
          int x,y,z;  cin>>x>>y>>z;
          a[i].id=i+1; a[i].chinese=x; a[i].score=x+y+z;
      }
      sort(a,a+n,cmp);
      for(int i = 0; i < 5; i++)cout<<a[i].id<<" "<<a[i].score<<"\n";
      return 0;
   }
   

5. 分数线划定 openjudge05

   #include<iostream>
   #include<algorithm>
   #include<string>
   using namespace std;
   const int maxn = 5050;
   struct node{ int id, score; }a[maxn];
   int cmp(node a, node b){
       if(a.score != b.score)return a.score>b.score;
       return a.id<b.id;
   }
   int main(){
      int n, m;  cin>>n>>m;  m=m*1.5;
      for(int i = 1; i <= n; i++)
          cin>>a[i].id>>a[i].score;
      sort(a+1,a+n+1,cmp);
      for(int i = m+1; i <= n; i++)
          if(a[i].score==a[m].score)m++;
      cout<<a[m].score<<" "<<m<<"\n";
      for(int i = 1; i <= m; i++)
          cout<<a[i].id<<" "<<a[i].score<<"\n";
      return 0;
   }
   

6. 整数奇偶排序 openjudge06

   #include<iostream>
   #include<algorithm>
   #include<string>
   using namespace std;
   const int maxn = 20;
   int a[maxn], b[maxn], an, bn;
   bool cmp(int a, int b){return a>b;}
   int main(){
      for(int i = 1; i <= 10; i++){
          int x;  cin>>x;
          if(x%2==1)a[an++]=x;
          else b[bn++]=x;
      }
      sort(a,a+an,cmp);
      sort(b,b+bn);
      for(int i = 0; i < an; i++)cout<<a[i]<<" ";
      for(int i = 0; i < bn; i++)cout<<b[i]<<" ";
      return 0;
   }
   

7. 合影效果 openjudge07

   #include<iostream>
   #include<cstdio>
   #include<algorithm>
   #include<string>
   using namespace std;
   const int maxn = 50;
   int an, bn;
   float a[maxn], b[maxn];
   bool cmp(float a, float b){return a>b;}
   int main(){
      int n;  cin>>n;
      for(int i = 1; i <= n; i++){
          string s;  cin>>s;
          float x;  cin>>x;
          if(s[0]=='m')a[an++]=x;
          else b[bn++]=x;
      }
      sort(a,a+an);
      sort(b,b+bn,cmp);
      for(int i = 0; i < an; i++)printf("%.2f ", a[i]);
      for(int i = 0; i < bn; i++)printf("%.2f ", b[i]);
      return 0;
   }
   

8. 病人排队 openjudge08

   #include<iostream>
   #include<algorithm>
   #include<string>
   using namespace std;
   const int maxn = 110;
   int an, bn;
   struct node{ string id; int age, que; }a[maxn], b[maxn];
   bool cmp1(node a, node b){ return a.age!=b.age?a.age>b.age:a.que<b.que; }
   bool cmp2(node a, node b){ return a.que<b.que; }
   int main(){
      int n;  cin>>n;
      for(int i = 1; i <= n; i++){
          string s; int x;  cin>>s>>x;
          if(x>=60){ a[an].id=s; a[an].que=i; a[an++].age=x; }
          else { b[bn].id=s; b[bn].que=i; b[bn++].age=x; }
      }
      sort(a,a+an,cmp1);
      sort(b,b+bn,cmp2);
      for(int i = 0; i < an; i++)cout<<a[i].id<<"\n";
      for(int i = 0; i < bn; i++)cout<<b[i].id<<"\n";
      return 0;
   }
   

9. 明明的随机数 openjudge09

   #include<iostream>
   #include<algorithm>
   using namespace std;
   const int maxn = 110;
   int a[maxn];
   int main(){
      int n;  cin>>n;
      for(int i = 0; i < n; i++)cin>>a[i];
      sort(a,a+n);
      n = unique(a,a+n)-a;
      cout<<n<<"\n";
      for(int i = 0; i < n; i++)cout<<a[i]<<" ";
      return 0;
   }
   

10. 单词排序 openjudge10

    #include<iostream>
    #include<algorithm>
    #include<string>
    #include<sstream>
    using namespace std;
    const int maxn = 110;
    string a[maxn];
    int main(){
      string s;  getline(cin,s);
      int n = 0;
      stringstream ss(s);
      while(ss>>a[n])n++;
      sort(a,a+n);
      n = unique(a,a+n)-a;
      for(int i = 0; i < n; i++)cout<<a[i]<<"\n";
      return 0;
    }
    

11. 出现次数超过一半的数 openjudge28

    //垃圾题目,浪费我一节课,我TM就桶排序了,你来打我啊
    #include<iostream>
    #include<algorithm>
    using namespace std;
    int n, a[1010];
    int main(){
        cin>>n;
        for(int i = 1; i <= n; i++){
            int x;  cin>>x;  a[x+100]++;
        }
        int t=0, tt=0;
        for(int i = 1; i <= 200; i++)
            if(a[i]>tt){ t=i; tt=a[i]; }
        if(tt>n/2)cout<<t-100<<"\n";else cout<<"no\n";
        return 0;
    }
    

12. 统计字符数 openjudge29

    #include<iostream>
    #include<string>
    using namespace std;
    int a[40];
    int main(){
        string s; getline(cin,s);
        for(int i = 0; i < s.size(); i++)a[s[i]-'a']++;
        int t=0, tt=0;
        for(int i = 0; i < 40; i++)
            if(a[i]>tt){ t=i; tt=a[i]; }
        cout<<(char)('a'+t)<<" "<<tt<<"\n";
        return 0;
    }
    

    ​