제출 #915038

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
915038		duckindog	자매 도시 (APIO20_swap)	C++14	0 / 100	2027 ms	14684 KiB

swap

#include "swap.h"

#include<bits/stdc++.h>

using namespace std;

const int N = 1e5 + 10,
          M = 1e3 + 10;
int n, m;
vector<pair<int, int>> ad[N];

bool chain;
vector<int> co;
void init(int N, int M, vector<int> U, vector<int> V, vector<int> W) {
  n = N; m = M;
  chain = 1;
  for (int i = 0; i < m; ++i) {
    int u = U[i], v = V[i], w = W[i];
    co.push_back(w);
    ad[u].push_back({v, w});
    ad[v].push_back({u, w});
    if (ad[u].size() > 2 || ad[v].size() > 2) chain = 0;
  }
  sort(co.begin(), co.end());
  co.resize(unique(co.begin(), co.end()) - co.begin());

}


bool dd[N];
int special;
bool dfs1(int u, int pre, int cw) {
  if (u == special) return 1;
  bool ret = 0;
  for (auto duck : ad[u]) {
    int v, w; tie(v, w) = duck;
    if (v == pre || w > cw) continue;
    if (!dd[v]) {
      dd[v] = 1;
      ret |= dfs1(v, u, cw);
    }
  }
  return ret;
}

bool dfs2(int u, int pre, int cw) {
  int cnt = 0;
  bool ret = 0;
  for (auto duck : ad[u]) {
    int v, w; tie(v, w) = duck;
    if (v == pre || w > cw) continue;
    if (dd[v]) return 1;
    dd[v] = 1;
    cnt += 1;
    ret |= dfs2(v, u, cw);
  }
  return (cnt > 2 || ret);
}

int getMinimumFuelCapacity(int X, int Y) {
  if (chain) return -1;

  int l = 0, r = co.size() - 1;
  int answer = 0;
  special = Y;
  while (l <= r) {
    int mid = l + r >> 1;

    bool ret = 1;
    memset(dd, 0, sizeof dd); ret &= dfs1(X, 0, co[mid]);
    memset(dd, 0, sizeof dd); ret &= dfs2(X, 0, co[mid]);

    if (ret) r = mid - 1, answer = co[mid];
    else l = mid + 1;
  }
  return answer;

}

컴파일 시 표준 에러 (stderr) 메시지

swap.cpp: In function 'int getMinimumFuelCapacity(int, int)':
swap.cpp:67:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   67 |     int mid = l + r >> 1;
      |               ~~^~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 23
• Subtask 6: 0 / 27