Submission #1217486

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217486		dosts	Nile (IOI24_nile)	C++20	Compilation error	0 ms	0 KiB

nile

#include "nile.h"
#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 4e9;


struct DSU {
  vi dad;
  vi sz;

  int ans = 0;

  DSU(int nn) {
    dad.resize(nn);
    iota(all(dad),0ll);
    sz.assign(n,1);
  }

  int find(int x) {
    if (x == dad[x]) return x;
    return dad[x] = find(dad[x]);
  }

  void unite(int a,int b) {
    int x = find(a),y = find(b);
    if (x == y) return;
    dad[x] = y;
    ans-=sz[x]/2;
    ans-=sz[y]/2;
    sz[y]+=sz[x];
    ans+=sz[y]/2;
  }
}dsu(LIM);

std::vector<long long> calculate_costs(std::vector<signed> W, std::vector<signed> A,
                                       std::vector<signed> B, std::vector<signed> E) {
  int Q = big(E);
  int N = big(W);
  vi inds(N);
  iota(all(inds),0ll);
  sort(all(inds),[&](int x,int y) {return W[x] < W[y];});
  vi benefit(N);
  int sm = 0;
  vector<pii> diffs;
  for (int i = 0;i<N;i++) {
    sm+=A[inds[i]];
    benefit[i] = A[inds[i]]-B[inds[i]];
    if (i) diffs.push_back({W[inds[i]]-W[inds[i-1]],i});
  }
  sort(all(diffs));
  vi R(Q);
  vector<pii> qs(Q);
  for (int i = 0;i<Q;i++) qs[i] = {E[i],i};
  sort(all(qs));
  int cur = 0;
  for (int i = 0;i<Q;i++) {
    while (!diffs.empty() && diffs.back().ff <= qs[i].ff) {
      int p = diffs.back().ss;
      dsu.unite(p-1,p);
    }
    R[qs[i].ss] = dsu.ans;
  }
  return R;
}

Compilation message (stderr)

nile.cpp: In constructor 'DSU::DSU(long long int)':
nile.cpp:26:15: error: 'n' was not declared in this scope; did you mean 'yn'?
   26 |     sz.assign(n,1);
      |               ^
      |               yn