Problem p02618 (C++) — buggy submission, verdict: Time Limit Exceeded

#include <bits/stdc++.h>
// ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
// clock_t start=clock();clock_t
// end=clock();cout<<(double)(end-start)/CLOCKS_PER_SEC<<endl;
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int ui;
typedef pair<int, int> pii;
typedef pair<pii, int> ppii;
typedef pair<int, pii> pipi;
typedef pair<ll, ll> pll;
typedef pair<pll, ll> ppll;
typedef pair<ll, pll> plpl;
typedef pair<pii, pii> pippi;
typedef tuple<ll, ll, ll> tl;
typedef pair<double, double> pdd;
typedef vector<vector<ll>> mat;
ll mod = 1000000007;
ll mod2 = 998244353;
ll mod3 = 1000003;
ll mod4 = 998244853;
ll mod5 = 1000000009;
ll inf = 1LL << 61;
int iinf = 1 << 30;
double pi = 3.141592653589793238462643383279L;
double eps = 1e-8;
#define rep(i, m, n) for (ll i = m; i < n; i++)
#define rrep(i, n, m) for (ll i = n; i >= m; i--)
#define srep(itr, st) for (auto itr = st.begin(); itr != st.end(); itr++)
#define mrep(itr, mp) for (auto &itr : mp)
#define Max(a, b) a = max(a, b)
#define Min(a, b) a = min(a, b)
// #define endl "\\n"
int dh[4] = {1, -1, 0, 0};
int dw[4] = {0, 0, 1, -1};
int ddh[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
int ddw[8] = {-1, 0, 1, -1, 1, -1, 0, 1};
struct custom_hash {
  static uint64_t splitmix64(uint64_t x) {
    // http://xorshift.di.unimi.it/splitmix64.c
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
  }

  size_t operator()(uint64_t x) const {
    static const uint64_t FIXED_RANDOM =
        chrono::steady_clock::now().time_since_epoch().count();
    return splitmix64(x + FIXED_RANDOM);
  }
};
#define umh unordered_map<int, int, custom_hash>
ll gcd(ll a, ll b) {
  if (a < b)
    swap(a, b);
  if (b == 0)
    return a;
  if (a % b == 0)
    return b;
  return gcd(b, a % b);
}
ll lcm(ll a, ll b) {
  ll c = gcd(a, b);
  return a * b / c;
}
ll Pow(ll n, ll k) {
  if (k < 0)
    return 0;
  ll ret = 1;
  ll now = n;
  while (k > 0) {
    if (k & 1)
      ret *= now;
    now *= now;
    k /= 2;
  }
  return ret;
}
ll beki(ll n, ll k, ll md) {
  ll ret = 1;
  ll now = n;
  now %= md;
  while (k > 0) {
    if (k % 2 == 1) {
      ret *= now;
      ret %= md;
    }
    now *= now;
    now %= md;
    k /= 2;
  }
  return ret;
}
ll gyaku(ll n, ll md) { return beki(n, md - 2, md); }
ll popcount(ll n) {
  ll ret = 0;
  ll u = n;
  while (u > 0) {
    ret += u % 2;
    u /= 2;
  }
  return ret;
}
random_device rnd;
mt19937 mt(rnd());

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int d;
  cin >> d;
  uniform_int_distribution<int> ra(1, 26), ra2(1, d);
  int c[26];
  rep(i, 0, 26) cin >> c[i];
  int s[d + 1][26];
  rep(i, 1, d + 1) rep(j, 0, 26) cin >> s[i][j];
  ll now = 0;
  vector<int> v[26];
  rep(i, 0, 26) v[i].push_back(0);
  int t[d + 1];
  rep(i, 1, d + 1) {
    int a = ra(mt);
    t[i] = a;
  }
  rep(i, 1, d + 1) {
    t[i]--;
    v[t[i]].push_back(i);
    now += s[i][t[i]];
    rep(j, 0, 26) {
      int las = v[j].back();
      now -= c[j] * (i - las);
    }
  }
  // cout<<now<<endl;

  rep(i, 0, 26) v[i].push_back(d + 1);
  rep(_, 0, 10000000) {
    ll mae = now;
    int dd, q;
    dd = ra2(mt);
    q = ra(mt);
    q--;
    int pre = t[dd];
    if (pre == q) {

      continue;
    }
    int y = lower_bound(v[pre].begin(), v[pre].end(), dd) - v[pre].begin();
    int d1 = v[pre][y - 1];
    int d3 = v[pre][y + 1];
    now += c[pre] * (d1 - dd) * (d3 - dd);
    // v[pre].erase(v[pre].begin()+y);
    int yy = lower_bound(v[q].begin(), v[q].end(), dd) - v[q].begin();
    int q1 = v[q][yy - 1], q3 = v[q][yy];
    now += c[q] * (dd - q1) * (q3 - dd);
    // v[q].insert(v[q].begin()+y,dd);
    // cout<<d1<<" "<<d3<<" "<<q1<<" "<<q3<<" "<<pre<<endl;
    now += s[dd][q] - s[dd][pre];
    if (now <= mae) {
      now = mae;
      continue;
    }
    t[dd] = q;
    v[pre].erase(v[pre].begin() + y);
    v[q].insert(v[q].begin() + yy, dd);
  }
  rep(i, 1, d + 1) cout << t[i] + 1 << endl;
}


Error: TLE

Fixed submission:

#include <bits/stdc++.h>
// ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
// clock_t start=clock();clock_t
// end=clock();cout<<(double)(end-start)/CLOCKS_PER_SEC<<endl;
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int ui;
typedef pair<int, int> pii;
typedef pair<pii, int> ppii;
typedef pair<int, pii> pipi;
typedef pair<ll, ll> pll;
typedef pair<pll, ll> ppll;
typedef pair<ll, pll> plpl;
typedef pair<pii, pii> pippi;
typedef tuple<ll, ll, ll> tl;
typedef pair<double, double> pdd;
typedef vector<vector<ll>> mat;
ll mod = 1000000007;
ll mod2 = 998244353;
ll mod3 = 1000003;
ll mod4 = 998244853;
ll mod5 = 1000000009;
ll inf = 1LL << 61;
int iinf = 1 << 30;
double pi = 3.141592653589793238462643383279L;
double eps = 1e-8;
#define rep(i, m, n) for (ll i = m; i < n; i++)
#define rrep(i, n, m) for (ll i = n; i >= m; i--)
#define srep(itr, st) for (auto itr = st.begin(); itr != st.end(); itr++)
#define mrep(itr, mp) for (auto &itr : mp)
#define Max(a, b) a = max(a, b)
#define Min(a, b) a = min(a, b)
// #define endl "\\n"
int dh[4] = {1, -1, 0, 0};
int dw[4] = {0, 0, 1, -1};
int ddh[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
int ddw[8] = {-1, 0, 1, -1, 1, -1, 0, 1};
struct custom_hash {
  static uint64_t splitmix64(uint64_t x) {
    // http://xorshift.di.unimi.it/splitmix64.c
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
  }

  size_t operator()(uint64_t x) const {
    static const uint64_t FIXED_RANDOM =
        chrono::steady_clock::now().time_since_epoch().count();
    return splitmix64(x + FIXED_RANDOM);
  }
};
#define umh unordered_map<int, int, custom_hash>
ll gcd(ll a, ll b) {
  if (a < b)
    swap(a, b);
  if (b == 0)
    return a;
  if (a % b == 0)
    return b;
  return gcd(b, a % b);
}
ll lcm(ll a, ll b) {
  ll c = gcd(a, b);
  return a * b / c;
}
ll Pow(ll n, ll k) {
  if (k < 0)
    return 0;
  ll ret = 1;
  ll now = n;
  while (k > 0) {
    if (k & 1)
      ret *= now;
    now *= now;
    k /= 2;
  }
  return ret;
}
ll beki(ll n, ll k, ll md) {
  ll ret = 1;
  ll now = n;
  now %= md;
  while (k > 0) {
    if (k % 2 == 1) {
      ret *= now;
      ret %= md;
    }
    now *= now;
    now %= md;
    k /= 2;
  }
  return ret;
}
ll gyaku(ll n, ll md) { return beki(n, md - 2, md); }
ll popcount(ll n) {
  ll ret = 0;
  ll u = n;
  while (u > 0) {
    ret += u % 2;
    u /= 2;
  }
  return ret;
}
random_device rnd;
mt19937 mt(rnd());

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int d;
  cin >> d;
  uniform_int_distribution<int> ra(1, 26), ra2(1, d);
  int c[26];
  rep(i, 0, 26) cin >> c[i];
  int s[d + 1][26];
  rep(i, 1, d + 1) rep(j, 0, 26) cin >> s[i][j];
  ll now = 0;
  vector<int> v[26];
  rep(i, 0, 26) v[i].push_back(0);
  int t[d + 1];
  rep(i, 1, d + 1) {
    int a = ra(mt);
    t[i] = a;
  }
  rep(i, 1, d + 1) {
    t[i]--;
    v[t[i]].push_back(i);
    now += s[i][t[i]];
    rep(j, 0, 26) {
      int las = v[j].back();
      now -= c[j] * (i - las);
    }
  }
  // cout<<now<<endl;

  rep(i, 0, 26) v[i].push_back(d + 1);
  rep(_, 0, 30000000) {
    ll mae = now;
    int dd, q;
    dd = ra2(mt);
    q = ra(mt);
    q--;
    int pre = t[dd];
    if (pre == q) {

      continue;
    }
    int y = lower_bound(v[pre].begin(), v[pre].end(), dd) - v[pre].begin();
    int d1 = v[pre][y - 1];
    int d3 = v[pre][y + 1];
    now += c[pre] * (d1 - dd) * (d3 - dd);
    // v[pre].erase(v[pre].begin()+y);
    int yy = lower_bound(v[q].begin(), v[q].end(), dd) - v[q].begin();
    int q1 = v[q][yy - 1], q3 = v[q][yy];
    now += c[q] * (dd - q1) * (q3 - dd);
    // v[q].insert(v[q].begin()+y,dd);
    // cout<<d1<<" "<<d3<<" "<<q1<<" "<<q3<<" "<<pre<<endl;
    now += s[dd][q] - s[dd][pre];
    if (now <= mae) {
      now = mae;
      continue;
    }
    t[dd] = q;
    v[pre].erase(v[pre].begin() + y);
    v[q].insert(v[q].begin() + yy, dd);
  }
  rep(i, 1, d + 1) cout << t[i] + 1 << endl;
}