牛客网北邮机试习题
答案部分（按顺序）
1 #include<iostream> 2 using namespace std; 3 string calcu(int n){ 4 int q,r; 5 string num; 6 char ch; 7 while(n>1){ 8 q=n/2; 9 r=n%2; 10 ch=r+48; 11 num=ch+num; 12 n=q; 13 } 14 if(q){ 15 ch=q+48; 16 num=ch+num; 17 } 18 return num; 19 } 20 int main(){ 21 int n;cin>>n; 22 cout<<calcu(n)<<endl; 23 return 0; 24 }
1 #include<iostream> 2 #include<queue> 3 #include<vector> 4 using namespace std; 5 int main(){ 6 priority_queue<int,vector<int>,greater<int>> p; 7 int n,w,sum=0;cin>>n; 8 while(n--){ 9 cin>>w; 10 p.push(w); 11 } 12 int a,b; 13 while(p.size()>1){ 14 a=(int)p.top();p.pop(); 15 b=(int)p.top();p.pop(); 16 p.push(a+b); 17 sum=sum+a+b; 18 } 19 cout<<sum<<endl; 20 return 0; 21 }
1 #include<iostream> 2 using namespace std; 3 int main(){ 4 int n,v; 5 int sumOdd=0,sumEve=0; 6 cin>>n; 7 while(n--){ 8 cin>>v; 9 if(v%2){ 10 sumOdd++; 11 }else{ 12 sumEve++; 13 } 14 } 15 if(sumEve>sumOdd){ 16 cout<<"NO"<<endl; 17 }else{ 18 cout<<"YES"<<endl; 19 } 20 return 0; 21 }
1 #include<iostream> 2 #include<set> 3 #include<iterator> 4 using namespace std; 5 int main(){ 6 int n,k,i;cin>>n; 7 set<int>s; 8 while(n--){ 9 cin>>k; 10 s.insert(k); 11 } 12 cin>>k; 13 set<int>::iterator it; 14 for(it=s.begin(),i=0;i<k-1;i++,it++); 15 cout<<*it<<endl; 16 return 0; 17 }
1 #include<iostream> 2 #include<string.h> 3 using namespace std; 4 int main(){ 5 int n,k;cin>>n>>k; 6 int i,j; 7 int **a=new int*[n]; 8 int **tmp=new int*[n]; 9 int **res=new int*[n]; 10 for(i=0;i<n;i++){ 11 a[i]=new int[n]; 12 tmp[i]=new int[n]; 13 res[i]=new int[n]; 14 for(j=0;j<n;j++){ 15 cin>>a[i][j]; 16 tmp[i][j]=a[i][j]; 17 } 18 } 19 int sum; 20 while(--k){ 21 for(i=0;i<n;i++){ 22 for(j=0;j<n;j++){ 23 sum=0; 24 for(int m=0;m<n;m++){ 25 sum=sum+tmp[i][m]*a[m][j]; 26 } 27 res[i][j]=sum; 28 } 29 } 30 for(i=0;i<n;i++) 31 for(j=0;j<n;j++){ 32 tmp[i][j]=res[i][j]; 33 } 34 } 35 for(i=0;i<n;i++){ 36 for(j=0;j<n;j++){ 37 if(j<n-1){ 38 cout<<tmp[i][j]<<" "; 39 }else{ 40 cout<<tmp[i][j]; 41 } 42 } 43 cout<<endl; 44 } 45 return 0; 46 }
1 #include<iostream> 2 using namespace std; 3 //important 坑所在地点，注意不在对角线的情况 4 void antiMatrix(int a[5][5],int x,int y,int cnt){ 5 int i,j,bi,bj; 6 int**b=new int*[cnt]; 7 for(i=0;i<cnt;i++){ 8 b[i]=new int[cnt]; 9 } 10 for(bi=0,i=x-1;bi<cnt,i<5&&i<x+cnt-1;bi++,i++)//copy 11 for(bj=0,j=y-1;bj<cnt,j<5&&j<y+cnt-1;bj++,j++) 12 b[bi][bj]=a[i][j]; 13 for(i=x-1,bi=0;i<5&&i<x+cnt-1,bi<cnt;i++,bi++)//anti 14 for(j=y-1,bj=0;j<5&&j<y+cnt-1,bj<cnt;j++,bj++) 15 a[i][j]=b[bj][bi]; 16 } 17 void inverse(int *a,int n){//一维数组 18 int *tmp=new int[n]; 19 for(int i=0;i<n;i++) 20 tmp[i]=a[i]; 21 for(int i=0;i<n;i++) 22 a[i]=tmp[n-1-i]; 23 } 24 void rotateClockwise(int a[5][5],int x,int y,int cnt,bool anti){ 25 if(!anti){ 26 antiMatrix(a,x,y,cnt); 27 for(int i=x-1;i<5&&i<x-1+cnt;i++){ 28 if(y-1+cnt-1<5){ 29 inverse(&a[i][y-1],cnt); 30 } else{ 31 inverse(&a[i][y-1],5-y+1); 32 } 33 } 34 }else{ 35 for(int i=x-1;i<5&&i<x-1+cnt;i++){ 36 if(y-1+cnt-1<5){ 37 inverse(&a[i][y-1],cnt); 38 } else{ 39 inverse(&a[i][y-1],5-y+1); 40 } 41 } 42 antiMatrix(a,x,y,cnt); 43 } 44 } 45 46 int main(){ 47 int a[5][5],c[4]; 48 int i,j,x,y; 49 for(i=0;i<5;i++) 50 for(j=0;j<5;j++) 51 cin>>a[i][j]; 52 for(i=0;i<4;i++) 53 cin>>c[i]; 54 if(c[0]==1&&c[1]==2){//顺时针90 4 55 rotateClockwise(a,c[2],c[3],2,false); 56 }else if(c[0]==1&&c[1]==3){//顺时针90 9 57 rotateClockwise(a,c[2],c[3],3,false); 58 }else if(c[0]==2&&c[1]==2){//逆时针90 4 59 rotateClockwise(a,c[2],c[3],2,true); 60 }else if(c[0]==2&&c[1]==3){//逆时针90.9 61 rotateClockwise(a,c[2],c[3],3,true); 62 } 63 for(i=0;i<5;i++){ 64 for(j=0;j<5;j++) 65 cout<<a[i][j]<<" "; 66 cout<<endl; 67 } 68 return 0; 69 }
1 #include<iostream> 2 #include<string.h> 3 using namespace std; 4 bool check(char key,int n,char *a){ 5 int m[10]; 6 memset(m,0,sizeof(m)); 7 for(int i=0;i<strlen(a);i++) 8 m[a[i]-48]++; 9 for(int i=key-48+1;i<10;i++) 10 if(m[i]>=n) 11 return true; 12 return false; 13 } 14 bool handler(int key,char *a,char *b){ 15 bool m[10]; 16 memset(m,false,sizeof(m)); 17 for(int i=0;i<strlen(a);i++) 18 if(a[i]-48>key) 19 m[a[i]-48]=true; 20 int sum=0; 21 for(int i=0;i<10-1;i++){ 22 if(sum>=5) 23 return true; 24 if(m[i]&&m[i+1]) 25 sum++; 26 else 27 sum=0; 28 } 29 if(sum>=5) 30 return true; 31 return false; 32 } 33 bool fiveHandler(char* a,char* b){ 34 bool flag=false; 35 switch(b[0]){ 36 case '1': 37 flag=handler(1,a,b); 38 break; 39 case '2': 40 flag=handler(2,a,b); 41 break; 42 case '3': 43 flag=handler(3,a,b); 44 break; 45 case '4': 46 flag=handler(4,a,b); 47 break; 48 default: 49 flag=false; 50 } 51 return flag; 52 } 53 int main(){ 54 char a[100],b[100]; 55 cin>>a>>b; 56 bool flag=false; 57 switch(strlen(b)){ 58 case 1: 59 flag=check(b[0],1,a); 60 break; 61 case 2: 62 flag=check(b[0],2,a); 63 break; 64 case 3: 65 flag=check(b[0],3,a); 66 break; 67 case 4: 68 flag=check(b[0],4,a); 69 break; 70 case 5: 71 flag=fiveHandler(a,b); 72 break; 73 } 74 if(flag) 75 cout<<"YES"<<endl; 76 else 77 cout<<"NO"<<endl; 78 return 0; 79 }
1 #include<iostream> 2 #include<math.h> 3 using namespace std; 4 int main(){ 5 int n,i,d;cin>>n; 6 int *v=new int[n+1]; 7 for(i=1;i<=n;i++) 8 cin>>v[i]; 9 cin>>d; 10 if(pow(2,d-1)>n){ 11 cout<<"EMPTY"<<endl; 12 return 0; 13 } 14 for(i=pow(2,d-1);i<=n&&i<pow(2,d);i++){ 15 if(i==n||i==pow(2,d)-1){ 16 cout<<v[i]<<endl; 17 }else{ 18 cout<<v[i]<<" "; 19 } 20 } 21 return 0; 22 }
1 #include<iostream> 2 #include<string.h> 3 #include<string> 4 #include<algorithm> 5 using namespace std; 6 void orderHandler(string order,string &ch){ 7 int i,j,begin,len; 8 begin=order[1]-'0'; 9 len=order[2]-'0'; 10 if(order[0]=='0'){//reverse 11 /* char tmp[101]; 12 for(i=begin,j=0;i<begin+len;i++,j++) 13 tmp[j]=ch[i]; 14 tmp[j]='\0'; 15 cout<<begin<<" "<<tmp<<endl; 16 for(i=begin,j=strlen(tmp)-1;i<begin+len,j>=0;i++,j--) 17 ch[i]=tmp[j];*/ 18 reverse(ch.begin()+begin,ch.begin()+begin+len); 19 }else if(order[0]=='1'){//replace 20 /*for(i=begin,j=3;i<ch.length()&&i<begin+len&&j<order.length();i++,j++) 21 ch[i]=order[j];*/ 22 ch.replace(begin,len,order.substr(3,order.length()-3)); 23 } 24 } 25 int main(){ 26 string ch,order; 27 int n; 28 while(cin>>ch>>n){ 29 while(n--){ 30 cin>>order; 31 orderHandler(order,ch); 32 cout<<ch<<endl; 33 } 34 } 35 return 0; 36 }
1 import java.util.Comparator; 2 import java.util.PriorityQueue; 3 import java.util.Scanner; 4 public class Main { 5 class node{ 6 int a,b,sqr; 7 String s; 8 node(){} 9 node(String str){ 10 s=str; 11 if(str.contains("+")){ 12 String []tmp=str.split("\\+"); 13 a=Integer.parseInt(tmp[0]); 14 tmp[1]=tmp[1].substring(1, tmp[1].length()); 15 b=Integer.parseInt(tmp[1]); 16 sqr=a*a+b*b; 17 } 18 } 19 }; 20 Scanner scanner; 21 int n; 22 String order; 23 PriorityQueue<node>pq; 24 Comparator<node>cmp; 25 Main(){ 26 scanner=new Scanner(System.in); 27 cmp=new Comparator<node>() { 28 @Override 29 public int compare(node o1, node o2) { 30 // TODO Auto-generated method stub 31 return o2.sqr-o1.sqr;//MaxHeap 32 } 33 }; 34 pq=new PriorityQueue<>(cmp); 35 } 36 public void func(){ 37 n=scanner.nextInt(); 38 scanner.nextLine();//important 39 while(n-->0){ 40 order=scanner.nextLine(); 41 if(order.equals("Pop")){ 42 if(pq.size()==0){ 43 System.out.println("empty"); 44 }else{ 45 System.out.println(pq.poll().s); 46 System.out.println("SIZE = "+pq.size()); 47 } 48 }else{ 49 String str=order.split(" ")[1]; 50 pq.add(new node(str)); 51 System.out.println("SIZE = "+pq.size()); 52 53 } 54 } 55 } 56 public static void main(String[] args)throws Exception{ 57 new Main().func(); 58 } 59 }
1 #include<iostream> 2 using namespace std; 3 struct node{ 4 int val; 5 node *left,*right; 6 node(int v):val(v){left=right=NULL;} 7 }; 8 void insert(node* &root,node* e){ 9 if(root){ 10 if(e->val<root->val) 11 insert(root->left,e); 12 else if(e->val>root->val) 13 insert(root->right,e); 14 }else{ 15 root=e; 16 } 17 } 18 void preOrder(node *root){ 19 if(root){ 20 cout<<root->val<<" "; 21 preOrder(root->left); 22 preOrder(root->right); 23 } 24 } 25 void inOrder(node *root){ 26 if(root){ 27 inOrder(root->left); 28 cout<<root->val<<" "; 29 inOrder(root->right); 30 } 31 } 32 void postOrder(node *root){ 33 if(root){ 34 postOrder(root->left); 35 postOrder(root->right); 36 cout<<root->val<<" "; 37 } 38 } 39 int main(){ 40 int n,v; 41 while(cin>>n){ 42 node *root=NULL; 43 while(n--){ 44 cin>>v; 45 insert(root,new node(v)); 46 } 47 preOrder(root);cout<<endl; 48 inOrder(root);cout<<endl; 49 postOrder(root);cout<<endl; 50 } 51 return 0; 52 }
1 #include<iostream> 2 using namespace std; 3 int main(){ 4 int n,x,y;cin>>n; 5 int minx,miny;minx=miny=0xffffff; 6 while(n--){ 7 cin>>x>>y; 8 if(x<minx){ 9 minx=x; 10 miny=y; 11 }else if(x==minx){ 12 if(y<miny) 13 miny=y; 14 } 15 } 16 cout<<minx<<" "<<miny<<endl; 17 return 0; 18 }
1 #include<iostream> 2 using namespace std; 3 bool seek(int *a,int n,int key){ 4 for(int i=0;i<n;i++) 5 if(a[i]==key) 6 return true; 7 return false; 8 } 9 int main(){ 10 int n,m; 11 while(cin>>n){ 12 int a[100],b[100]; 13 for(int i=0;i<n;i++) 14 cin>>a[i]; 15 cin>>m; 16 for(int i=0;i<m;i++) 17 cin>>b[i]; 18 for(int i=0;i<m;i++){ 19 if(seek(a,n,b[i])) 20 cout<<"YES"<<endl; 21 else 22 cout<<"NO"<<endl; 23 } 24 } 25 }
