def kSumII(self, A, k, target):
        ret = []
        self.dfs(A, 0, k, [], target, ret)
        return ret
Signal handler to log the stack trace of the current thread.
dataset/ETHPy150Open algorhythms/LintCode/k Sum II.py/Solution.kSumII--crossover with--dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/ioloop.py/IOLoop.log_stack