    delta = rescap[arcForward];
    vertex = head[arcBackward];
    while (vertex != source) {
      arcBackward = path[vertex];
      vertex = head[arcBackward];
      arcForward = arcBackward + 1;
      if (arcBackward % 2 == 0) {
        arcForward = arcBackward - 1;
      }
      if (delta > rescap[arcBackward]) {
        delta = rescap[arcForward];
      }
      console.log("\n");