#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 <ll, ll>;
using pil = pair <ll, ll>;
using pli = pair <ll, ll>;
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 ll maxN = 3e5 + 1;
const ll maxR = 3e4;
ll n, r, q, sq;
vector <ll> color[maxR];
vector <ll> adj[maxN];
vector <vector<ll>> cnt, rcnt;
ll pos[maxN], be[maxN], child[maxN];
ll dpos[maxN], time_in;
ll bit[maxN];
void update(ll x, ll val){
for (; x <= n; x += x & -x){
bit[x] += val;
}
}
ll get(ll x){
ll sum = 0;
for (; x; x -= x & -x){
sum += bit[x];
}
return sum;
}
void pre_dfs(ll u){
dpos[u] = ++time_in;
for (const ll &i: adj[u]){
pre_dfs(i);
child[u] += child[i] + 1;
}
}
ll dfs(ll u, ll c, ll up = 0){
ll summ = 0;
if (be[u] == c) ++up;
else rcnt[rcnt.size() - 1][be[u]] += up;
for (const ll &i: adj[u]){
summ += dfs(i, c, up);
}
if (be[u] == c) return summ + 1;
cnt[cnt.size() - 1][be[u]] += summ;
return summ;
}
void Init(){
cin >> n >> r >> q;
sq = sqrt(n) + 1;
ll t; cin >> t;
be[1] = t;
color[t].pb(1);
for (ll i = 2; i <= n; ++i){
ll p, t;
cin >> p >> t;
color[t].pb(i);
be[i] = t;
adj[p].pb(i);
}
pre_dfs(1);
for (ll 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 (ll i = 1; i <= q; ++i){
ll u, v;
cin >> u >> v;
if (color[v].size() >= sq){
cout << cnt[pos[v]][u] << endl;
}
else if (color[u].size() >= sq){
cout << rcnt[pos[u]][v] << endl;
}
else{
for (const ll &i: color[v]){
update(dpos[i], 1);
}
ll ans = 0;
for (const ll &i: color[u]){
ans += get(dpos[i] + child[i]) - get(dpos[i]);
}
cout << ans << endl;
for (const ll &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
regions.cpp: In function 'void Init()':
regions.cpp:86:29: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
86 | if (color[i].size() >= sq){
| ~~~~~~~~~~~~~~~~^~~~~
regions.cpp:98:29: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
98 | if (color[v].size() >= sq){
| ~~~~~~~~~~~~~~~~^~~~~
regions.cpp:101:34: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long 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);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
12696 KB |
Output is correct |
| 2 |
Correct |
6 ms |
8012 KB |
Output is correct |
| 3 |
Correct |
6 ms |
8048 KB |
Output is correct |
| 4 |
Correct |
9 ms |
8016 KB |
Output is correct |
| 5 |
Correct |
10 ms |
8120 KB |
Output is correct |
| 6 |
Correct |
19 ms |
8144 KB |
Output is correct |
| 7 |
Correct |
17 ms |
8144 KB |
Output is correct |
| 8 |
Correct |
29 ms |
8272 KB |
Output is correct |
| 9 |
Correct |
52 ms |
8656 KB |
Output is correct |
| 10 |
Correct |
103 ms |
8724 KB |
Output is correct |
| 11 |
Correct |
136 ms |
9168 KB |
Output is correct |
| 12 |
Correct |
175 ms |
9808 KB |
Output is correct |
| 13 |
Correct |
247 ms |
9552 KB |
Output is correct |
| 14 |
Correct |
323 ms |
24384 KB |
Output is correct |
| 15 |
Correct |
448 ms |
18276 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1335 ms |
122408 KB |
Output is correct |
| 2 |
Correct |
1459 ms |
74340 KB |
Output is correct |
| 3 |
Correct |
2992 ms |
63744 KB |
Output is correct |
| 4 |
Correct |
378 ms |
10192 KB |
Output is correct |
| 5 |
Correct |
447 ms |
12028 KB |
Output is correct |
| 6 |
Runtime error |
123 ms |
131072 KB |
Execution killed with signal 9 |
| 7 |
Runtime error |
202 ms |
131072 KB |
Execution killed with signal 9 |
| 8 |
Runtime error |
146 ms |
131072 KB |
Execution killed with signal 9 |
| 9 |
Correct |
3905 ms |
20044 KB |
Output is correct |
| 10 |
Runtime error |
206 ms |
131072 KB |
Execution killed with signal 9 |
| 11 |
Correct |
7167 ms |
21020 KB |
Output is correct |
| 12 |
Correct |
2321 ms |
31576 KB |
Output is correct |
| 13 |
Correct |
2653 ms |
32080 KB |
Output is correct |
| 14 |
Correct |
3258 ms |
125920 KB |
Output is correct |
| 15 |
Correct |
4339 ms |
36664 KB |
Output is correct |
| 16 |
Correct |
4313 ms |
43976 KB |
Output is correct |
| 17 |
Runtime error |
221 ms |
131072 KB |
Execution killed with signal 9 |
