Problem p02647 (C++) — buggy submission, verdict: Time Limit Exceeded

#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
ll MOD = 1000000007;

#define vec vector<int>
#define vecll vector<ll>
#define vecd vector<double>
#define vecst vector<string>
#define vecb vector<bool>
#define vec2(var, n, m) vector<vector<int>> var(n, vector<int>(m, 0))
#define vecll2(var, n, m) vector<vector<ll>> var(n, vector<ll>(m, 0))

#define rep(i, n) for (ll i = (ll)0; i < (ll)n; i++)
#define REP(i, m, n) for (ll i = (ll)m; i < (ll)n; i++)
#define arr(var, n)                                                            \\
  vec var(n);                                                                  \\
  rep(i, n) { cin >> var[i]; }
#define arrll(var, n)                                                          \\
  vecll var(n);                                                                \\
  rep(i, n) { cin >> var[i]; }
#define arrst(var, n)                                                          \\
  vecst var(n);                                                                \\
  rep(i, n) { cin >> var[i]; }
#define all(var) (var).begin(), (var).end()
#define sortall(var) sort(all(var))
#define uniqueall(v) v.erase(unique(v.begin(), v.end()), v.end());
#define f_sum(var) accumulate(all(var), 0)
#define f_sumll(var) accumulate(all(var), 0LL)
#define chmin(v1, v2) v1 = min(v1, v2)
#define chmax(v1, v2) v1 = max(v1, v2)
#define pb(var) push_back(var)
#define prt(var) cout << (var) << "\\n"
#define prtd(n, var) cout << fixed << setprecision(n) << (var) << "\\n"
#define prtfill(n, var) cout << setw(n) << setfill('0') << (var);
#define prt2(v1, v2) cout << (v1) << " " << (v2) << "\\n"
#define prt3(v1, v2, v3) cout << (v1) << " " << (v2) << " " << (v3) << "\\n"
#define prtall(v)                                                              \\
  rep(i, v.size()) { cout << v[i] << (i != v.size() - 1 ? " " : "\\n"); }
void prtok(bool ok) { prt(ok ? "YES" : "NO"); }
//----------------------------------------------------------------

int main(void) {
  int n, k;
  cin >> n >> k;
  arr(a, n);

  rep(_, min(k, 200)) {
    vecll imosu(n + 2, 0);
    REP(i, 1, n + 1) {
      if (i - (a[i - 1]) < 1) {
        imosu[1] += 1;
      } else {
        imosu[i - (a[i - 1])] += 1;
      }
      if (i + (a[i - 1]) + 1 > n + 1) {
        imosu[n + 1] -= 1;
      } else {
        imosu[i + (a[i - 1]) + 1] -= 1;
      }
    }
    vecll sum(n + 1, 0);
    rep(i, n) { sum[i + 1] = sum[i] + imosu[i + 1]; }
    rep(i, n) { a[i] = sum[i + 1]; }
  }

  prtall(a);
}


Error: TLE

Fixed submission:

#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
ll MOD = 1000000007;

#define vec vector<int>
#define vecll vector<ll>
#define vecd vector<double>
#define vecst vector<string>
#define vecb vector<bool>
#define vec2(var, n, m) vector<vector<int>> var(n, vector<int>(m, 0))
#define vecll2(var, n, m) vector<vector<ll>> var(n, vector<ll>(m, 0))

#define rep(i, n) for (ll i = (ll)0; i < (ll)n; i++)
#define REP(i, m, n) for (ll i = (ll)m; i < (ll)n; i++)
#define arr(var, n)                                                            \\
  vec var(n);                                                                  \\
  rep(i, n) { cin >> var[i]; }
#define arrll(var, n)                                                          \\
  vecll var(n);                                                                \\
  rep(i, n) { cin >> var[i]; }
#define arrst(var, n)                                                          \\
  vecst var(n);                                                                \\
  rep(i, n) { cin >> var[i]; }
#define all(var) (var).begin(), (var).end()
#define sortall(var) sort(all(var))
#define uniqueall(v) v.erase(unique(v.begin(), v.end()), v.end());
#define f_sum(var) accumulate(all(var), 0)
#define f_sumll(var) accumulate(all(var), 0LL)
#define chmin(v1, v2) v1 = min(v1, v2)
#define chmax(v1, v2) v1 = max(v1, v2)
#define pb(var) push_back(var)
#define prt(var) cout << (var) << "\\n"
#define prtd(n, var) cout << fixed << setprecision(n) << (var) << "\\n"
#define prtfill(n, var) cout << setw(n) << setfill('0') << (var);
#define prt2(v1, v2) cout << (v1) << " " << (v2) << "\\n"
#define prt3(v1, v2, v3) cout << (v1) << " " << (v2) << " " << (v3) << "\\n"
#define prtall(v)                                                              \\
  rep(i, v.size()) { cout << v[i] << (i != v.size() - 1 ? " " : "\\n"); }
void prtok(bool ok) { prt(ok ? "YES" : "NO"); }
//----------------------------------------------------------------

int main(void) {
  int n, k;
  cin >> n >> k;
  arr(a, n);

  arr(v, n);
  while (k) {
    vecll imosu(n + 2, 0);
    REP(i, 1, n + 1) {
      if (i - (a[i - 1]) < 1) {
        imosu[1] += 1;
      } else {
        imosu[i - (a[i - 1])] += 1;
      }
      if (i + (a[i - 1]) + 1 > n + 1) {
        imosu[n + 1] -= 1;
      } else {
        imosu[i + (a[i - 1]) + 1] -= 1;
      }
    }
    vecll sum(n + 1, 0);
    rep(i, n) { sum[i + 1] = sum[i] + imosu[i + 1]; }
    rep(i, n) { a[i] = sum[i + 1]; }
    k--;
    if (a == v) {
      break;
    }
  }

  prtall(a);
}