Submission #217440

#	Time	Username	Problem	Language	Result	Execution time	Memory
217440		2fat2code	Traffickers (RMI18_traffickers)	C++14	0 / 100	3594 ms	28528 KiB

traffickers

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define all(a) (a).begin(), (a).end()
//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC taraget("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define sz() size()
#define fr first
#define sc second
#define pi pair<int,int>
#define pii pair<pair<int,int>,int>
#define int long long
#define mp make_pair
#define rc(s) return cout<<s,0
#define rcc(s) cout<<s,exit(0)
using namespace std;

const int mod=1e9+7;
const int modp=1999999973;
const int modulo=998244353;

const int nmax=30005;

int n,q,parinte[nmax],lca[nmax][23],aib[21][21][2*nmax],first[nmax],last[nmax],depth[nmax];
vector<int>nod[nmax],euler;

void DFS(int s,int par,int lvl){
    euler.push_back(s);
    parinte[s]=par;
    depth[s]=lvl;
    for(auto it:nod[s]){
        if(it!=par){
            DFS(it,s,lvl+1);
            euler.push_back(s);
        }
    }
}


int findLCA(int x, int y){
	for(int j = 18; j >= 0; j--){
		if(depth[x] - (1<<j) >= depth[y]){
			x = lca[x][j];
		}
	}
	if(x==y)return x;

	for(int j = 18; j >= 0; j--){
		if(lca[y][j] && lca[x][j]!=lca[y][j]){
			x = lca[x][j];
			y = lca[y][j];
		}
	}
	return lca[x][0];
}

void update(int pos,int val,int aib[]){
    while(pos<=euler.size()){
        aib[pos]+=val;
        pos+=(pos&-pos);
    }
}

int sum(int pos,int aib[]){
    int rs=0;
    while(pos){
        rs+=aib[pos];
        pos-=(pos&-pos);
    }
    return rs;
}

void query12(int x,int y,int type){
    int lc=findLCA(x,y);
    vector<int>path;
    while(x!=lc){
        path.push_back(x);
        x=parinte[x];
    }
    vector<int>tz;
    while(y!=lc){
        tz.push_back(y);
        y=parinte[y];
    }
    tz.push_back(y);
  if(tz.size())  for(int i=tz.size()-1;i>=0;i--) path.push_back(tz[i]);
    for(int i=0;i<=19;i++){
        int nod = path[i%path.size()];
        if(type==1){
            update(first[nod],1,aib[i][path.size()]);
            update(last[nod]+1,-1,aib[i][path.size()]);
        }
        else{
            update(first[nod],-1,aib[i][path.size()]);
            update(last[nod]+1,1,aib[i][path.size()]);
        }
    }
}

int query3(int x,int y,int t1,int t2){
    int cnt[20];
    int lc=findLCA(x,y);
    for(int i=0;i<=19;i++) cnt[i]=0LL;
    int cnturr=20LL;
    while(t1<t2 && t1%cnturr!=0LL){
        cnt[t1%(cnturr)]++;
        t1++;
    }
    while(t2>t1 && t2%(cnturr)!=19LL){
        cnt[t2%(cnturr)]++;
        t2--;
    }
    if(t1==t2){
        cnt[t1%(cnturr)]++;
    }
    else{
        int curr=(t2-t1+1LL)/(cnturr);
        for(int i=0;i<=19;i++) cnt[i]+=curr;
    }
    int ans=0LL;
    for(int i=0;i<=19;i++){
        for(int j=1;j<=20;j++){
            int curr=cnt[i]*(sum(first[x],aib[i][j])+sum(first[y],aib[i][j])-sum(first[lc],aib[i][j])-sum(first[parinte[lc]],aib[i][j]));
            ans+=curr;
        }
    }
    return ans;
}

int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
    srand(chrono::steady_clock::now().time_since_epoch().count());
    cin >> n;
    for(int i=1;i<n;i++){
        int x,y;
        cin >> x >> y;
        nod[x].push_back(y);
        nod[y].push_back(x);
    }
    DFS(1,-1,0);
    int pop=0;
    for(auto it:euler){
        pop++;
        if(first[it]==0){
            first[it]=pop;
            last[it]=pop;
        }
        else last[it]=pop;
    }
    for(int i=1;i<=n;i++) lca[i][0]=parinte[i];
    for(int i=1;(1<<i)<=n;i++){
        for(int j=1;j<=n;j++) lca[j][i]=lca[lca[j][i-1]][i-1];
    }
    parinte[1]=0;
    cin >> q;
    for(int i=1;i<=q;i++){
        int x,y;
        cin >> x >> y;
        query12(x,y,1);
    }
    cin >> q;
    int t=0;
    for(int i=1;i<=q;i++){
        cin >> t;
        if(t==1 || t==2){
            int x,y;
            cin >> x >> y;
            query12(x,y,t);
        }
        else{
            int x,y,t1,t2;
            cin >> x >> y >> t1 >> t2;
            int pls = query3(x,y,t1,t2);
            cout << pls << '\n';
        }
    }
}

Compilation message (stderr)

traffickers.cpp: In function 'void update(long long int, long long int, long long int*)':
traffickers.cpp:59:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(pos<=euler.size()){
           ~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40