Problem p02604 (C++) — buggy submission, verdict: Time Limit Exceeded

#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

#define FOR_LT(i, beg, end) for (int i = (int)(beg); i < (int)(end); i++)
#define FOR_LE(i, beg, end) for (int i = (int)(beg); i <= (int)(end); i++)
#define FOR_DW(i, beg, end) for (int i = (int)(beg); (int)(end) <= i; i--)
#define REP(n) for (int repeat_index = 0; repeat_index < (int)n; repeat_index++)

double E = 2.71828182845904523536028747;

using namespace std;

struct P {
  int64_t x;
  int64_t y;
  int64_t p;
};

int64_t evaluate(const vector<P> &ps, const vector<int64_t> xl,
                 const vector<int64_t> yl, const vector<bool> sel) {
  int64_t sum = 0;

  vector<int64_t> cxl;
  vector<int64_t> cyl;
  FOR_LT(i, 0, sel.size()) {
    if (sel[i]) {
      if (i < xl.size())
        cxl.push_back(xl[i]);
      else
        cyl.push_back(yl[i - xl.size()]);
    }
  }

  for (auto &p : ps) {
    int64_t minv = min(abs(p.x), abs(p.y)) * p.p;
    for (auto &x : cxl) {
      minv = min(minv, abs(p.x - x) * p.p);
    }
    for (auto &y : cyl) {
      minv = min(minv, abs(p.y - y) * p.p);
    }
    sum += minv;
  }
  return sum;
}

int64_t annealing(vector<P> &ps, vector<int64_t> &xl, vector<int64_t> &yl,
                  int n) {
  if (xl.size() + yl.size() <= n)
    return 0;

  int nl = xl.size() + yl.size();
  vector<bool> sel(nl);

  static random_device rnd;
  static mt19937 mt(rnd());

  uniform_int_distribution<> sell(0, nl - 1);
  uniform_int_distribution<> selk(0, n - 1);
  uniform_int_distribution<> selnk(0, nl - n - 1);
  uniform_real_distribution<double> selr(0, 1.0);

  FOR_LT(i, 0, n) {
    while (true) {
      int l = sell(mt);
      if (sel[l])
        continue;
      sel[l] = true;
      break;
    }
  }

  int64_t ans = evaluate(ps, xl, yl, sel);
  int64_t cans = ans;
  double t = ans;
  double lt = t;
  int repeat = 100000;
  REP(repeat) {
    // cout << ans << " " << cans << " " << t << endl;
    int k = selk(mt);
    int nk = selnk(mt);

    int kidx = 0;
    {
      for (int i = 0; i < k; i++) {
        while (!sel[kidx])
          kidx++;
        kidx++;
      }
      while (!sel[kidx])
        kidx++;
    }

    int nkidx = 0;
    {
      for (int i = 0; i < nk; i++) {
        while (sel[nkidx])
          nkidx++;
        nkidx++;
      }
      while (sel[nkidx])
        nkidx++;
    }

    sel[kidx] = false;
    sel[nkidx] = true;
    int64_t nans = evaluate(ps, xl, yl, sel);
    if (nans < cans) {
      cans = nans;
      ans = min(ans, cans);
    } else {
      if (selr(mt) < exp((cans - nans) / t)) {
        cans = nans;
      } else {
        sel[kidx] = true;
        sel[nkidx] = false;
      }
    }

    lt = 0.9 * lt + 0.1 * (cans - ans);
    if (lt < 1E-10)
      break;
    t = (repeat - repeat_index) / repeat * lt;
  }

  return ans;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout << fixed << setprecision(20);

  int n;
  cin >> n;

  vector<P> ps(n);
  FOR_LT(i, 0, n) {
    auto &p = ps[i];
    cin >> p.x >> p.y >> p.p;
  }

  vector<int64_t> xl(n);
  FOR_LT(i, 0, n) { xl[i] = ps[i].x; }
  sort(xl.begin(), xl.end());
  xl.erase(unique(xl.begin(), xl.end()), xl.end());

  vector<int64_t> yl(n);
  FOR_LT(i, 0, n) { yl[i] = ps[i].y; }
  sort(yl.begin(), yl.end());
  yl.erase(unique(yl.begin(), yl.end()), yl.end());

  cout << evaluate(ps, xl, yl, vector<bool>()) << endl;
  FOR_LE(i, 1, n) {
    int64_t ans = INT64_MAX;
    for (int k = 0; k < 10; k++) {
      ans = min(ans, annealing(ps, xl, yl, i));
    }
    cout << ans << endl;
  }

  return 0;
}

Error: TLE

Fixed submission:

#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

#define FOR_LT(i, beg, end) for (int i = (int)(beg); i < (int)(end); i++)
#define FOR_LE(i, beg, end) for (int i = (int)(beg); i <= (int)(end); i++)
#define FOR_DW(i, beg, end) for (int i = (int)(beg); (int)(end) <= i; i--)
#define REP(n) for (int repeat_index = 0; repeat_index < (int)n; repeat_index++)

double E = 2.71828182845904523536028747;

using namespace std;

struct P {
  int64_t x;
  int64_t y;
  int64_t p;
};

int64_t evaluate(const vector<P> &ps, const vector<int64_t> xl,
                 const vector<int64_t> yl, const vector<bool> sel) {
  int64_t sum = 0;

  vector<int64_t> cxl;
  vector<int64_t> cyl;
  FOR_LT(i, 0, sel.size()) {
    if (sel[i]) {
      if (i < xl.size())
        cxl.push_back(xl[i]);
      else
        cyl.push_back(yl[i - xl.size()]);
    }
  }

  for (auto &p : ps) {
    int64_t minv = min(abs(p.x), abs(p.y)) * p.p;
    for (auto &x : cxl) {
      minv = min(minv, abs(p.x - x) * p.p);
    }
    for (auto &y : cyl) {
      minv = min(minv, abs(p.y - y) * p.p);
    }
    sum += minv;
  }
  return sum;
}

int64_t annealing(vector<P> &ps, vector<int64_t> &xl, vector<int64_t> &yl,
                  int n) {
  if (xl.size() + yl.size() <= n)
    return 0;

  int nl = xl.size() + yl.size();
  vector<bool> sel(nl);

  static random_device rnd;
  static mt19937 mt(rnd());

  uniform_int_distribution<> sell(0, nl - 1);
  uniform_int_distribution<> selk(0, n - 1);
  uniform_int_distribution<> selnk(0, nl - n - 1);
  uniform_real_distribution<double> selr(0, 1.0);

  FOR_LT(i, 0, n) {
    while (true) {
      int l = sell(mt);
      if (sel[l])
        continue;
      sel[l] = true;
      break;
    }
  }

  int64_t ans = evaluate(ps, xl, yl, sel);
  int64_t cans = ans;
  double t = ans * nl;
  while (true) {
    // cout << ans << " " << cans << " " << t << endl;
    int k = selk(mt);
    int nk = selnk(mt);

    int kidx = 0;
    {
      for (int i = 0; i < k; i++) {
        while (!sel[kidx])
          kidx++;
        kidx++;
      }
      while (!sel[kidx])
        kidx++;
    }

    int nkidx = 0;
    {
      for (int i = 0; i < nk; i++) {
        while (sel[nkidx])
          nkidx++;
        nkidx++;
      }
      while (sel[nkidx])
        nkidx++;
    }

    sel[kidx] = false;
    sel[nkidx] = true;
    int64_t nans = evaluate(ps, xl, yl, sel);
    if (nans < cans) {
      cans = nans;
      ans = min(ans, cans);
    } else {
      if (selr(mt) < exp((cans - nans) / t)) {
        cans = nans;
      } else {
        sel[kidx] = true;
        sel[nkidx] = false;
      }
    }

    t = (t + 2.0 * nl * (cans - ans)) / 3.0;
    // cout << t << endl;
    if (t < 1E-10)
      break;
  }

  return ans;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout << fixed << setprecision(20);

  int n;
  cin >> n;

  vector<P> ps(n);
  FOR_LT(i, 0, n) {
    auto &p = ps[i];
    cin >> p.x >> p.y >> p.p;
  }

  vector<int64_t> xl(n);
  FOR_LT(i, 0, n) { xl[i] = ps[i].x; }
  sort(xl.begin(), xl.end());
  xl.erase(unique(xl.begin(), xl.end()), xl.end());

  vector<int64_t> yl(n);
  FOR_LT(i, 0, n) { yl[i] = ps[i].y; }
  sort(yl.begin(), yl.end());
  yl.erase(unique(yl.begin(), yl.end()), yl.end());

  cout << evaluate(ps, xl, yl, vector<bool>()) << endl;
  FOR_LE(i, 1, n) {
    int64_t ans = INT64_MAX;
    for (int k = 0; k < n; k++) {
      ans = min(ans, annealing(ps, xl, yl, i));
    }
    cout << ans << endl;
  }

  return 0;
}