Submission #212392

#	Time	Username	Problem	Language	Result	Execution time	Memory
212392		nicolaalexandra	Traffickers (RMI18_traffickers)	C++14	100 / 100	2946 ms	31096 KiB

traffickers

#include <bits/stdc++.h>
#define DIM 30002
/*#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
*/
using namespace std;


vector <int> L[DIM];
vector <int> chains[DIM];

int aib[20][21][DIM];

int whatChain[DIM],chainFatherNode[DIM],Size[DIM],posAib[DIM];
int level[DIM],fth[DIM],w[22],aux[22];


int n,m,i,j,tip,q,k,t1,t2,nr_chains,el,el2;
int x,y;
long long sum;

void update_aib (int a, int b, int p, int n, int val){
    for (;p<=n;p+=(p&-p))
        aib[a][b][p] += val;
}
long long query_aib (int p){
    if (!p)
        return 0;

    long long sol = 0;

    for (int a=0;a<20;++a){
        if (a > t2)
            break;
        for (int b=a+1;b<=20;++b){
            long long sum = 0;

            /// sum din aib
            for (int i=p;i;i-=(i&-i))
                sum += aib[a][b][i];

            if (t2 >= a){

                int nr = (t2 - a) / b + 1;

                sol += sum * nr;
            }
            if (t1-1 >= a){

                int nr = (t1-1 - a) / b + 1;

                sol -= sum * nr;
            }}}

    return sol;
}

long long get_sum (int x, int y){
    return query_aib (y) - query_aib (x-1);
}

void dfs (int nod, int tata){

    fth[nod] = tata;
    level[nod] = 1 + level[tata];
    Size[nod] = 1;
    int ok = 0, maxim = 0, poz = 0;
    for (auto vecin : L[nod]){
        if (vecin != tata){
            ok = 1;
            dfs (vecin,nod);

            Size[nod] += Size[vecin];

            if (Size[vecin] > maxim)
                maxim = Size[vecin], poz = vecin;

        }}

    if (!ok){
        nr_chains++;
        chains[nr_chains].push_back(0);
        chains[nr_chains].push_back(nod);

        whatChain[nod] = nr_chains;

    } else {

        chains[whatChain[poz]].push_back(nod);

        whatChain[nod] = whatChain[poz];

        for (auto vecin : L[nod]){
            if (vecin == tata || vecin == poz)
                continue;
            chainFatherNode[whatChain[vecin]] = nod;
        }}}


void drum (int x, int y){

    el = el2 = 0;

    while (x != y){
        if (level[x] > level[y]){
            w[++el] = x;
            x = fth[x];
        } else {
            aux[++el2] = y;
            y = fth[y];
        }
    }
    w[++el] = x;

    for (j=el2;j>=1;j--)
        w[++el] = aux[j];

}
void adauga (int x, int y){

    drum (x,y);

    /// in w am lantul de la x la y

    int t = 0, lg = el;
    for (int i=1;i<=el;i++){
        int nod = w[i];

        update_aib(t,lg,posAib[nod],n,1);

        t++;
    }
}
void scoate (int x, int y){
    drum (x,y);

    int t = 0, lg = el;

    for (int i=1;i<=el;i++){
        int nod = w[i];
        update_aib(t,lg,posAib[nod],n,-1);

        t++;
    }
}

void query_heavy (int x, int y){
    if (whatChain[x] == whatChain[y]){
        int posx = posAib[x], posy = posAib[y];
        if (posx > posy)
            swap (posx,posy);
        sum += get_sum (posx,posy);
        return;
    }
    if (level[chainFatherNode[whatChain[x]]] <= level[chainFatherNode[whatChain[y]]])
        swap (x,y);

    sum += get_sum (posAib[x],posAib[ chains[whatChain[x]][ chains[whatChain[x]].size()-1 ] ]);

    int nr = chainFatherNode[whatChain[x]];
    query_heavy (nr,y);
}


long long solve (int x, int y, int t1, int t2){

    sum = 0;
    query_heavy(x,y);

    return sum;

}
int main (){

  //  ifstream cin ("traffickers.in");
  //  ofstream cout ("traffickers.out");

    cin>>n;
    for (i=1;i<n;++i){
        cin>>x>>y;
        L[x].push_back(y);
        L[y].push_back(x);
    }
    dfs (1,0);

    int idx = 0;

    for (i=1;i<=nr_chains;++i)
        for (j=1;j<chains[i].size();++j){
            int nod = chains[i][j];
            posAib[nod] = ++idx;
        }


    cin>>m; /// nr inital de traficanti
    for (i=1;i<=m;++i){
        cin>>x>>y;
        adauga (x,y);
    }

    cin>>q;
    for (;q--;){
        cin>>tip>>x>>y;
        if (tip == 1){
            adauga (x,y);
            continue;
        }
        if (tip == 2){
            scoate (x,y);
            continue;
        }
        cin>>t1>>t2;
        cout<<solve(x,y,t1-1,t2)<<"\n";
    }

    return 0;
}

Compilation message (stderr)

traffickers.cpp: In function 'int main()':
traffickers.cpp:190:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (j=1;j<chains[i].size();++j){
                  ~^~~~~~~~~~~~~~~~~

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