Submission #777353

#	Time	Username	Problem	Language	Result	Execution time	Memory
777353		ETO_leader	Regions (IOI09_regions)	C++17	0 / 100	78 ms	29952 KiB

regions

#include<bits/stdc++.h>
#define cir(i,a,b) for(int i=a;i<b;++i)
using namespace std;
using lint=long long;
using VI=vector<int>;
using VL=vector<lint>;
vector<VI> G;vector<VL> cx;
VI tin,tout,w,col;
void dfs(int u,int&cnx,int f=0){
    tin[u]=cnx++;
    for(auto&i:G[u]) if(i!=f) dfs(i,cnx,u);
    tout[u]=cnx;
}
bool isancestor(int u,int v){
    return tin[u]<=tin[v]&&tout[v]<=tout[u];
}
void dfsx(int u,int ci,int wx=0,int f=0){
    w[u]=(wx+=(col[u]==ci));
    for(auto&i:G[u]) if(i!=f) dfsx(i,ci,wx,u);
}
void init(int n){
    G.resize(n+1);tin.resize(n+1);col.resize(n+1);
    tout.resize(n+1);w.resize(n+1);
}
int main(){
    ios::sync_with_stdio(false),cin.tie(0);
    int n,r,q;cin>>n>>r>>q;init(n);
    const int sqr=pow<double>(n,3.0/1.0)+1;
    VL cnx(r+1),idx(n+1);
    vector<VI> ci(r+1);
    cin>>col[1];cnx[col[1]]++;ci[col[1]].push_back(1);
    cir(i,2,n+1){
        int f;cin>>f>>col[i];cnx[col[i]]++;
        G[f].push_back(i);G[i].push_back(f);
        ci[col[i]].push_back(i);
    }
    [&](){int ncnx=0;dfs(1,ncnx);}();
    return 0;
}

Compilation message (stderr)

regions.cpp: In function 'int main()':
regions.cpp:28:15: warning: unused variable 'sqr' [-Wunused-variable]
   28 |     const int sqr=pow<double>(n,3.0/1.0)+1;
      |               ^~~

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