BZOJ3542£ºDZY Loves March

ѯÎÊÊÇÒªÇó$\sum_{i=1}^n((x[i]-a)^2+(y[i]-b)^2)(x[i]=a||y[i]=b)$¼´Çó$\sum_{i=1}^n(x[i]-a)^2(y[i]=b)+\sum_{i=1}^n(y[i]-b)^2(x[i]=a)$²ð¿ªµÃ$\sum_{i=1}^n(x[i]^2-2ax...