#include<iostream> using namespace std; int main(){ /** //int, long long, float, double, bool, char; int a[5] float[5]...... long long [5] != int[5] //我们班编程的成绩int a[11]={400,400,310,300,240,210,200,140,110,60,40}; for(int i=0;i<11;i++){ cout<<a[i]<<endl; } //数组的定义; int a[10]; //输入; for(int i=0;i<10;i++){ cin>>a[i]; } //输出; for(int i=9;i>=0;i--){ cout<<a[i]<<" "; } int a[10]; for(int i=0;i<10;i++){ cin>>a[i]; } int y,p=a[0]; for(int i=1;i<10;i++){ if(a[i]>p){ y=i; p=a[i]; } } cout<<y+1; int n; cin>>n; int a[n],b[n]; for(int i=0;i<n;i++){ cin>>a[i]; } for(int i=0;i<n;i++){ cin>>b[i]; } long long sum=0; for(int i=0;i<n;i++){ sum+=a[i]*b[i]; } cout<<sum; **/ int n; cin>>n; int a[n]; for(int i=0;i<n;i++){ cin>>a[i]; } if(n%2!=0){ for(int i=0;i<n-1;i+=2){ int y; y=a[i]; a[i]=a[i+1]; a[i+1]=y; cout<<a[i]<<" "<<a[i+1]<<" "; } cout<<a[n-1]; }else{ for(int i=0;i<=n-1;i+=2){ int y; y=a[i]; a[i]=a[i+1]; a[i+1]=y; cout<<a[i]<<" "<<a[i+1]<<" "; } } return 0; }