This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <cassert>
#include <iomanip>
#include <map>
#include <unordered_map>
using namespace std;
const int N = 200200;
const int R = 505;
vector<int> g[N];
vector<vector<int>> rr(R);
vector<int> region(N);
int timer = 1;
vector<int> lq(N), rq(N);
vector<int> vals = {0};
void dfs(int a) {
lq[a] = timer;
vals.push_back(region[a]);
for (auto &d: g[a]) {
timer++;
dfs(d);
}
rq[a] = timer;
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n, r, q;
cin >> n >> r >> q;
for (int i = 1; i <= n; i++) {
if (i == 1) {
int x;
cin >> x;
region[i] = x;
}
else {
int f, x;
cin >> f >> x;
region[i] = x;
g[f].push_back(i);
}
}
dfs(1);
for (int i = 1; i <= n; i++) {
rr[region[vals[i]]].push_back(i);
}
vector<vector<int>> zz(r + 1);
for (int i = 1; i <= n; i++) zz[region[i]].push_back(i);
assert(vals.size() == n + 1);
for (int i = 0; i < q; i++) {
int r1, r2;
cin >> r1 >> r2;
assert(r1 <= R);
int ans = 0;
for (auto &vrt: zz[r1]) {
int _l = lq[vrt], _r = rq[vrt];
//cout << vrt << " " << _l << " " << _r << "\n";
ans += (upper_bound(rr[r2].begin(), rr[r2].end(), _r) - lower_bound(rr[r2].begin(), rr[r2].end(), _l));
}
cout << ans << endl;
cout.flush();
}
}
Compilation message (stderr)
In file included from /usr/include/c++/10/cassert:44,
from regions.cpp:5:
regions.cpp: In function 'int main()':
regions.cpp:56:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
56 | assert(vals.size() == n + 1);
| ~~~~~~~~~~~~^~~~~~~~
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |