Submission #796080

#	Time	Username	Problem	Language	Result	Execution time	Memory
796080		NeroZein	Chess Rush (CEOI20_chessrush)	C++17	Compilation error	0 ms	0 KiB

chessrush

#include <bits/stdc++.h>
 
using namespace std;
 
const int INF = 1e9; 
 
int getDis (vector<int> h1, vector<int> h2) {
  if (h1.empty() || h2.empty()) {
    return INF; 
  }
  int ret = INF; 
  int i = 0, j = 0;
  int n = h1.size(), m = h2.size();
  while (i < n || j < m) {
    if (i < n && (j == m || h1[i] < h2[j])) {
      if (j < m) {
        ret = min(ret, h2[j] - h1[i]);        
      }
      i++;
    } else {
      if (i < n) {
        ret = min(ret, h1[i] - h2[j]);         
      }
      j++; 
    }
  }
  return ret;
}
 
const int MX_N = 1e5 + 5;
const int MX_DAYS = 1e4 + 5;
 
int h[MX_N];
vector<int> friends[MX_N];
 
void invert (int u, int v) {
  auto ite = find(friends[u].begin(), friends[u].end(), v); 
  if (ite != friends[u].end()) {//erase
    friends[u].erase(ite);
    ite = find(friends[v].begin(), friends[v].end(), u);
    friends[v].erase(ite);
  } else {
    int n = friends[u].size();
    int m = friends[v].size();
    bool inserted_v = false;
    for (int i = 0; i < n; ++i) {
      if (h[friends[u][i]] > h[v]) {
        inserted_v = true;
        friends[u].insert(friends[u].begin() + i, v);
      }
    }
    if (!inserted_v) {
      friends[u].push_back(v);
    }
    bool inserted_u = false;
    for (int i = 0; i < m; ++i) {
      if (h[friends[v][i]] > h[u]) {
        inserted_u = true;
        friends[v].insert(friends[v].begin() + i, u);        
      }
    }
    if (!inserted_u) {
      friends[v].push_back(u); 
    }
  }
}
 
int ppl;
 
void init(int N, int D, int H[]) {
  ppl = N;
  for (int i = 0; i < N; ++i) {
    h[i] = H[i];
  }
}
 
void curseChanges(int U, int A[], int B[]) {
  for (int day = 1; day <= U; ++day) {
    int u = A[day - 1], v = B[day - 1];
    invert(u, v); 
  }
}
 
int question(int x, int y, int v) {
  if (x == y) {
    return 0;
  }
  vector<int> h1, h2;
  for (int i : friends[x]) {
    h1.push_back(h[i]);
  }
  for (int i : friends[y]) {
    h2.push_back(h[i]);
  }
  return getDis(h1, h2); 
}

Compilation message (stderr)

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
collect2: error: ld returned 1 exit status