pat乙1027. 打印沙漏

#include<iostream>#include<cmath>#include<string>using namespace std;int n;char a;int main(){while(cin>>n>>a){int cnt=0;int row=sqrt((n+1)/2);for(int i=2*row-1;i>=1;i-=2){cout<<string(((2*row-1)-i)/2,' ')<<string(i,a)<<endl;cnt+=i;}for(int i=3;i<=2*row-1;i+=2){cout<<string(((2*row-1)-i)/2,' ')<<string(i,a)<<endl;cnt+=i;}cout<<n-cnt<<endl;}return 0; }