Submission #915124

#	Time	Username	Problem	Language	Result	Execution time	Memory
915124		duckindog	Swapping Cities (APIO20_swap)	C++14	Compilation error	0 ms	0 KiB

swap

#include<bits/stdc++.h>

using namespace std;

#include "swap.h"


#define int long long

const int N = 1e5 + 10;

int n, m;
vector<pair<int, int>> ad[N];

vector<int> co;
void init(int N, int M, vector<int> U, vector<int> V, vector<int> W) {
  n = N; m = M;
  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});

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

  return (cnt > 2 || ret);
}

int getMinimumFuelCapacity(int X, int Y) {

  int l = 0, r = co.size() - 1;
  int answer = -1;
  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;
}

Compilation message (stderr)

swap.cpp: In function 'long long int getMinimumFuelCapacity(long long int, long long int)':
swap.cpp:71:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   71 |     int mid = l + r >> 1;
      |               ~~^~~
/usr/bin/ld: /tmp/cc7fk0h4.o: in function `main':
grader.cpp:(.text.startup+0x1c3): undefined reference to `init(int, int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
/usr/bin/ld: grader.cpp:(.text.startup+0x223): undefined reference to `getMinimumFuelCapacity(int, int)'
collect2: error: ld returned 1 exit status