Submission #1096907

#	Time	Username	Problem	Language	Result	Execution time	Memory
1096907		dmitryAdams	Bridges (APIO19_bridges)	C++17	29 / 100	416 ms	4440 KiB

bridges

#ifdef NN_LOCALE
#define _GLIBCXX_DEBUG
#endif
#include "iostream"
#include "vector"
#include "cstdint"

using namespace std;

struct edge {
  int v, u, d;
};

vector<edge> e;

vector<vector<int>> g;

vector<int> used;
int cnt = 0;
void dfs(int v, int w, int clr) {
  used[v] = clr;
  ++cnt;
  for (auto ind : g[v]) {
    int d = e[ind].d;
    int u = e[ind].u ^ e[ind].v ^ v;
    if (d >= w && used[u] != clr) {
      dfs(u, w, clr);
    }
  }
}

vector<int> b;
vector<int> tr;
void build(int v, int l, int r) {
  if (r - l == 1) {
    tr[v] = b[l];
    return;
  }
  int m = (r + l) / 2;
  build(2 * v + 1, l, m);
  build(2 * v + 2, m, r);
  tr[v] = min(tr[2 * v + 1], tr[2 * v + 2]);
}

void upd(int i, int x, int v, int l, int r) {
  if (r - l == 1) {
    tr[v] = x;
    return;
  }
  int m = (r + l) / 2;
  if (i < m) {
    upd(i, x, 2 * v + 1, l, m);
  } else {
    upd(i, x, 2 * v + 2, m, r);
  }
  tr[v] = min(tr[2 * v + 1], tr[2 * v + 2]);
}

int get(int ql, int qr, int v, int l, int r) {
  if (ql == qr) return -1;
  if (ql == l && qr == r) {
    return tr[v];
  }
  int m = (r + l) / 2;
  if (qr <= m) {
    return get(ql, qr, 2 * v + 1, l, m);
  } else if (ql >= m) {
    return get(ql, qr, 2 * v + 2, m, r);
  } else {
    return min(get(ql, m, 2 * v + 1, l, m), get(m, qr, 2 * v + 2, m, r));
  }
}

signed main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
#ifdef NN_LOCALE
  freopen("in", "r", stdin);
  freopen("out", "w", stdout);
#endif
  int n, m;
  cin >> n >> m;
  if (n <= 1000 && m <= 1000) {
    g.resize(n);
    used.resize(n);
    for (int i = 0; i < m; ++i) {
      int v, u, d;
      cin >> v >> u >> d;
      --v, --u;
      g[v].push_back(i);
      g[u].push_back(i);
      e.push_back({v, u, d});
    }
    int q;
    cin >> q;
    int c = 0;
    while (q--) {
      int t;
      cin >> t;
      if (t == 1) {
        int bi, r;
        cin >> bi >> r;
        --bi;
        e[bi].d = r;
      } else {
        int s, w;
        cin >> s >> w;
        --s;
        cnt = 0;
        dfs(s, w, ++c);
        cout << cnt << '\n';
      }
    }
  } else {
    b.resize(m);
    for (int i = 0; i < m; ++i) {
      int v;
      cin >> v >> v;
      cin >> b[i];
    }
    int q;
    cin >> q;
    tr.resize(4 * m);
    build(0, 0, m);
    while (q--) {
      int t;
      cin >> t;
      if (t == 1) {
        int bi, r;
        cin >> bi >> r;
        --bi;
        upd(bi, r, 0, 0, m);
      } else {
        int s, w;
        cin >> s >> w;
        --s;
        int ans = 1;
        int l = 0, r = s + 1;
        while (r - l > 1) {
          int mid = (r + l) / 2;
          if (get(s - mid, s, 0, 0, m) >= w) {
            l = mid;
          } else {
            r = mid;
          }
        }
        ans += l;
        l = 0, r = n - s;
        while (r - l > 1) {
          int mid = (r + l) / 2;
          if (get(s, s + mid, 0, 0, m) >= w) {
            l = mid;
          } else {
            r = mid;
          }
        }
        ans += l;
        cout << ans << '\n';
      }
    }
  }
  return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 16 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27