再看x<=0&&y<=0：x取绝对值，y取绝对值，若x>=y&&x!=0&&y!=0,dis=(2*x-1)*(2*x-1)+(x-y),若x<y&&x!=0&&y!=0，dis=(2*y+1)*(2*y+1)-(y+1-x)
其中需要特殊考虑x和y的负半轴，x!=0&&y==0，dis=(2*x-1)*(2*x-1)+(x-1)，当x==0&&y!=0，dis=(2*y+1)*(2*y+1)-(y+1)
再看x>0&&y<0时：y取绝对值，当x<=y，dis=(2*y+1)*(2*y)+(y-x)，当x>y时，dis=(2*x+1)*(2*x)-(x-y)
代码：
#include<iostream> using namespace std; typedef long long ll; int main() { ll x,y,i,j; cin>>x>>y; if(x>=0&&y>=0) { if(y>=x) cout<<(2*y)*(2*y)-(y-x)<<endl; else if(y<x) cout<<(2*x)*(2*x)+(x-y)<<endl; } else if(x<0&&y>0) { x=-x; if(x>=y) cout<<(2*x-1)*(2*x)-(x-y)<<endl; else if(x<y) cout<<(2*y-1)*(2*y)+(y-x)<<endl; } else if(x<=0&&y<=0) { x=-x;y=-y; if(x>=y&&x!=0&&y!=0) { cout<<(2*x-1)*(2*x-1)+(x-y)<<endl; } else if(x<y&&x!=0&&y!=0) cout<<(2*y+1)*(2*y+1)-(y+1-x)<<endl; else if(x!=0&&y==0) cout<<(2*x-1)*(2*x-1)+(x-1)<<endl; else if(x==0&&y!=0) cout<<(2*y+1)*(2*y+1)-(y+1)<<endl; } else if(x>0&&y<0) { y=-y; if(x<=y) cout<<(2*y+1)*(2*y)+(y-x)<<endl; else if(x>y) cout<<(2*x+1)*(2*x)-(x-y)<<endl; } return 0; }