Put higher weight on unsolvable-yet-but-solvable-by-this

[HiroIshida]

However, the result indicates that, weighting rather make thing worse...

nonweightとnonweight+nonreduceとを比べると, reduceした方がよさそう

ただ, これ試行ごとにばらつきがあるのかな... nonweight + reduceを試行回数変えてやってみるか