Submission #595361

#	Time	Username	Problem	Language	Result	Execution time	Memory
595361		Do_you_copy	Regions (IOI09_regions)	C++17	0 / 100	259 ms	131072 KiB

regions

#include <bits/stdc++.h>
#define taskname "test"
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
using ull = unsigned ll;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

//const ll Mod = 1000000009;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 1e5 + 1;
const int maxR = 25000 + 1;
int n, r, q, sq;
vector <int> color[maxR];
vector <int> adj[maxN];
vector <vector<ll>> cnt, rcnt;
int pos[maxN], be[maxN], child[maxN];
int dpos[maxN], time_in;
int bit[maxN];

void update(int x, int val){
    for (; x <= n; x += x & -x){
        bit[x] += val;
    }
}

int get(int x){
    int sum = 0;
    for (; x; x -= x & -x){
        sum += bit[x];
    }
    return sum;
}

void pre_dfs(int u){
    dpos[u] = ++time_in;
    for (const int &i: adj[u]){
        pre_dfs(i);
        child[u] += child[i] + 1;
    }
}

int dfs(int u, int c, int up = 0){
    int sum = 0;
    if (be[u] == c) ++up;
    else rcnt[rcnt.size() - 1][be[u]] += up;
    for (const int &i: adj[u]){
        sum += dfs(i, c, up);
    }
    if (be[u] == c) return sum + 1;
    cnt[cnt.size() - 1][be[u]] += sum;
    return sum;
}

void Init(){
    cin >> n >> r >> q;
    sq = sqrt(n) + 1;
    int t; cin >> t;
    be[1] = t;
    color[t].pb(1);
    for (int i = 2; i <= n; ++i){
        int p, t;
        cin >> p >> t;
        color[t].pb(i);
        be[i] = t;
        adj[p].pb(i);
    }
    pre_dfs(1);
    for (int i = 1; i <= r; ++i){
        if (color[i].size() >= sq){
            pos[i] = cnt.size();
            cnt.pb({});
            rcnt.pb({});
            cnt.back().resize(maxN, 0);
            rcnt.back().resize(maxN, 0);
            dfs(1, i);
        }
    }
    for (int i = 1; i <= q; ++i){
        int u, v;
        cin >> u >> v;
        if (color[v].size() >= sq){
            cout << cnt[pos[v]][u] << "\n";
        }
        else if (color[u].size() >= sq){
            cout << rcnt[pos[u]][v] << "\n";
        }
        else{
            for (const int &i: color[v]){
                update(dpos[i], 1);
            }
            ll ans = 0;
            for (const int &i: color[u]){
                ans += get(dpos[i] + child[i]) - get(dpos[i]);
            }
            cout << ans << "\n";
            for (const int &i: color[v]){
                update(dpos[i], -1);
            }
        }
    }
}


int main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        //freopen(taskname".out", "w", stdout);
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
}

Compilation message (stderr)

regions.cpp: In function 'void Init()':
regions.cpp:86:29: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   86 |         if (color[i].size() >= sq){
      |             ~~~~~~~~~~~~~~~~^~~~~
regions.cpp:98:29: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   98 |         if (color[v].size() >= sq){
      |             ~~~~~~~~~~~~~~~~^~~~~
regions.cpp:101:34: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  101 |         else if (color[u].size() >= sq){
      |                  ~~~~~~~~~~~~~~~~^~~~~
regions.cpp: In function 'int main()':
regions.cpp:123:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  123 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 85