DS1-1

#include <iostream>
#include <algorithm>
using namespace std;

struct duo{
    int xi,mi;
}a[1000],b[1000],c[1000];

bool cmp(duo x,duo y){
    return x.mi>y.mi;
}
int main(){
    int n,m;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>a[i].xi>>a[i].mi;
    }
    sort(a,a+n,cmp);
    
    cin>>m;
    for(int i=0;i<m;i++){
        cin>>b[i].xi>>b[i].mi;
    }
    sort(b,b+n,cmp);
    int cnt=0;
    for(int i=0,j=0;i<n+m&&j<n+m;){//枚举
        if(b[j].mi>a[i].mi) {c[cnt].xi=b[j].xi,c[cnt].mi=b[j].mi,j++,cnt++;continue;}
        if(b[j].mi<a[i].mi) {c[cnt].xi=a[i].xi,c[cnt].mi=a[i].mi,i++,cnt++;continue;}
        if(b[j].mi==a[i].mi) {c[cnt].xi=b[j].xi+a[i].xi,c[cnt].mi=a[i].mi,i++,j++,cnt++;continue;}
    }   
    
    for(int i=0;i<n+m;i++){
        if(c[i].xi!=0) cout<<c[i].xi<<" "<<c[i].mi<<endl;
    }
    return 0;
}

DS2-1

#include <iostream>
#include <vector>
#include <cstring>
#include <algorithm>

using namespace std;

typedef pair <int,int> PII;

PII s[1000];
int top,rf;
bool check(int t){
    if(top==0) return 0;
    return s[top--].first=t;
}
int main(){
    string a;
    cin>>a;
    for(int i=0;i<a.size();i++){
        if(a[i]=='('){
            s[++top].first=1;
            s[top].second=i;
        }
        if(a[i]==')'){
            if(!check(1)){
                cout<<"right "<<i<<" ";
                rf=1;//表明右括号匹配失败 
            }
        }
    }
    if(rf) return 0;
    else{
        if(top==0){
            cout<<"ok";
        }
        else{
            cout<<"left ";
            while(top!=0){ 
            cout<<s[top--].second<<" ";
            } 
        }
    }
    return 0; 
}

DS2-2

#include <iostream>
#include <vector>

using namespace std;


int main(){
    string a;
    cin>>a;
    vector <int> C;
    for(int i=0;i<a.size();i++){
        if(a[i]!='+'&&a[i]!='-'&&a[i]!='*'&&a[i]!='/'){
            C.push_back(a[i]-'0');
        }
        if(a[i]=='+'){
            int x=C.back();
            C.pop_back();
            int y=C.back();
            C.pop_back();
            C.push_back(x+y);
        }
        if(a[i]=='-'){
            int x=C.back();
            C.pop_back();
            int y=C.back();
            C.pop_back();
            C.push_back(y-x);
        }
        if(a[i]=='*'){
            int x=C.back();
            C.pop_back();
            int y=C.back();
            C.pop_back();
            C.push_back(x*y);
        }
        if(a[i]=='/'){
            int x=C.back();
            C.pop_back();
            int y=C.back();
            C.pop_back();
            C.push_back(y/x);
        }
    }
    cout<<C[0];
    return 0;
}

A1-1：

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int a[3];

int main(){
    cin>>a[0]>>a[1]>>a[2];
    sort(a,a+3);
    cout<<a[2]<<" "<<a[1]<<" "<<a[0];
    return 0;
}

A1-3：

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int y,m,d;

int main(){
    cin>>y>>m;
    if(m==2){
        d=28+(y%4==0&&y%100||y%400==0);
    }
    else if(m==4||m==6||m==9||m==11) d=30;
    else d=31;
    cout<<d;
    return 0;
}

A2-2 ：

#include <iostream>
using namespace std;

const int N =50;
int n;
int fib[N];
int main(){
    cin>>n;
    fib[0]=1;
    fib[1]=1;
    for(int i=2;i<n;i++) fib[i]=fib[i-1]+fib[i-2];
    for(int i=0;i<n;i++) cout<<fib[i]<<" ";
    return 0;
}

A3-2:

#include <iostream>
using namespace std;

int main(){
    int n,flag=0;
    cin>>n;
    for(int i=2;i<n;i++){
        if(n%i==0){
            flag=1;
            break;
        }
    }
    if(!flag) cout<<"Yes";
    else cout<<"No";
    return 0;
}

A3-4:

#include <iostream>
#include <vector>
using namespace std;
bool check(int x){
    for(int i=2;i<x;i++){
        if(x%i==0) return false;
        if((x%2)==0) return false;
    }
    return true;
}
int main(){
    int n;
    cin>>n;
    vector <int> C;
    for(int i=2;i<n;i++){
        if(check(i)) C.push_back(i);
    }
    for(int i=0;i<C.size();i++){
        for(int j=i;j<C.size();j++){
            if(C[i]+C[j]==n) cout<<C[i]<<"+"<<C[j]<<"="<<n<<endl;
        }
    }
    return 0;
}