Senoufou: I wonder how other countries deal with this, on the Continent or Scandinavia for example.

From personal experience I can say that homeless people living on the streets are quite a visible presence in Norway at least. This is surprising considering that Norway is, per capita, one of the richest nations on earth.

Statistically about 1.3% of the Norwegian population are defined as homeless, compared with about 1.7% of the UK population. To be honest, I was surprised that it's so close considering Norway's per capita income, its social policies and its sovereign wealth fund from oil and gas. Possibly indicating a problem somewhat more complex than just the ability or will to throw funds at it?