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- n=parseInt(readline())
- t=[]
- s=({j,k},{l,m})=>(j-l)**2+(k-m)**2
- for(let i = 0; i < n; i++) {
- e = readline().split(' ');
- t.push({x:e[0]*1,y:e[1]*1})
- }
- t.forEach( ({x,y})=>print(x,y) )
- print(t.reduce((z,q)=>z+s({z.x,z.y},{q.x,q.y}),0))
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