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cells.size() has int type.

Try use ROS_INFO("size: [%d]", msg->cells.size()); Not %f. What result will be?

cells.size() has int type.

Try use ROS_INFO("size: [%d]", [%d]", msg->cells.size()); Not %f. What result will be?

cells.size() has int type.

Try use ROS_INFO("size: [%d]", msg->cells.size()); Not %f. What result will be?