Submission #492261

#	Time	Username	Problem	Language	Result	Execution time	Memory
492261		lukameladze	Regions (IOI09_regions)	C++14	100 / 100	6419 ms	57892 KiB

regions

# include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define pii pair <int, int>
using namespace std;
const int N = 2e5 + 5, B = 500;
int tin,in[N],out[N],r1,r2,fer,n,le,ri,up,hea[N],lig[N],col[N],r,q,p[N],idx[N];
multiset <pii> :: iterator it;
int mpp[N],shes[N];
long long ans[550][30000],anss;
vector <int> heavy,light;
vector <int> v[N],v1[N];
multiset <pii> ms[N];
vector <pii> vv;
multiset <int> mss;
void dfs(int a, int p) {
    tin++;
    in[a] = tin;
    vv.pb({in[a],a});
    for (int i = 0; i < v[a].size(); i++) {
        int to = v[a][i];
        if (to == p) continue;
        dfs(to,a);
    }
    out[a] = tin;
}
void dfs1(int a, int p) {
    if (hea[col[a]]) {
        mpp[col[a]]++;
    }
    for (int j = 0; j < heavy.size(); j++) {
        fer = heavy[j];
        if (mpp[fer]) ans[shes[fer]][col[a]]+= mpp[fer];
    }
    for (int i = 0; i < v[a].size(); i++) {
        int to = v[a][i];
        if (to == p) continue;
        dfs1(to,a);
    }
    if (hea[col[a]]) mpp[col[a]]--;
}
main() {
    cin>>n>>r>>q;
    for (int i = 1; i <= n; i++) {
       if (i != 1) cin>>p[i],v[p[i]].pb(i),v[i].pb(p[i]);
        cin>>col[i];
        v1[col[i]].pb(i);
    }
    for (int i = 1; i <= r; i++) {
        if (v1[i].size() >= B) heavy.pb(i), hea[i] = 1;
        else light.pb(i),lig[i] = 1;
    }
    for (int j = 0; j < heavy.size(); j++) {
    	shes[heavy[j]] = j;
	}
      dfs(1,0);
      sort(vv.begin(),vv.end());
    for (int i = 0; i < vv.size(); i++) {
        idx[col[vv[i].s]]++;
        ms[col[vv[i].s]].insert({vv[i].f,idx[col[vv[i].s]]});
    }
    dfs1(1,0);
    while(q--) {
        cin>>r1>>r2;
        if (lig[r1]) {
            int anss = 0;
            for (int i = 0; i < v1[r1].size(); i++) {
                up = v1[r1][i];
                it = ms[r2].lower_bound({in[up],0});
                if (it == ms[r2].end()) continue;
                le = (*it).s;
                it = ms[r2].upper_bound({out[up],1e9});
                if (it == ms[r2].end()) ri = ms[r2].size();
                else ri = (*it).s - 1;
                anss += (ri - le + 1);
            }
            cout<<anss<<"\n";
            continue;
        }
        cout<<ans[shes[r1]][r2]<<"\n";
    }
}

Compilation message (stderr)

regions.cpp: In function 'void dfs(int, int)':
regions.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i = 0; i < v[a].size(); i++) {
      |                     ~~^~~~~~~~~~~~~
regions.cpp: In function 'void dfs1(int, int)':
regions.cpp:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int j = 0; j < heavy.size(); j++) {
      |                     ~~^~~~~~~~~~~~~~
regions.cpp:36:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for (int i = 0; i < v[a].size(); i++) {
      |                     ~~^~~~~~~~~~~~~
regions.cpp: At global scope:
regions.cpp:43:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   43 | main() {
      | ^~~~
regions.cpp: In function 'int main()':
regions.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int j = 0; j < heavy.size(); j++) {
      |                     ~~^~~~~~~~~~~~~~
regions.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for (int i = 0; i < vv.size(); i++) {
      |                     ~~^~~~~~~~~~~
regions.cpp:68:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |             for (int i = 0; i < v1[r1].size(); i++) {
      |                             ~~^~~~~~~~~~~~~~~

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