代码

#include "router.h"
#include <map>

std::map<unsigned, RoutingTableEntry> m[33];

void init(int n, int q, const RoutingTableEntry *a) {
  for (int i = 0; i < n; i ++) {
    unsigned addr = a[i].addr;
    int len = (int)(a[i].len);
    m[len][addr] = a[i];
  }
}

unsigned query(unsigned addr) {
  for (int len = 32; len >= 0; len --) {
    if (m[len].count(addr) != 0) {
      return m[len][addr].nexthop;
    }
  }
  return 0;
}

评测结果