Submission #295573

#	Time	Username	Problem	Language	Result	Execution time	Memory
295573		eohomegrownapps	Werewolf (IOI18_werewolf)	C++14	0 / 100	4097 ms	34056 KiB

werewolf

#include "werewolf.h"
#include <bits/stdc++.h>
using namespace std;

vector<int> l;
vector<int> r;
int n,q;
int sqrtq;

vector<vector<int>> adjlist;

bool comp(int a, int b){
    if (l[a]/sqrtq == l[b]/sqrtq){
        return r[a]<r[b];
    } else {
        return l[a]<l[b];
    }
}


std::vector<int> check_validity(int N, std::vector<int> x, std::vector<int> y,
                                std::vector<int> s, std::vector<int> e,
                                std::vector<int> L, std::vector<int> R) {
    q = s.size();
    l=L;r=R;n=N;
    sqrtq=sqrt(q);


    vector<int> inds(q);
    for (int i = 0; i<q; i++){
        inds[i]=i;
    }    
    sort(inds.begin(),inds.end(),comp);
    /*for (int i : inds){
        cout<<l[i]<<' '<<r[i]<<'\n';
    }*/
    adjlist.resize(n);
    for (int i = 0; i<x.size(); i++){
        //cout<<x[i]<<' '<<y[i]<<endl;
        adjlist[x[i]].push_back(y[i]);
        adjlist[y[i]].push_back(x[i]);
    }

    int start = -1;
    for (int i = 0; i<n; i++){
        if (adjlist[i].size()==1){
            start=i;
            break;
        }
    }
    int cur = start;
    int pre = -1;
    int ptr = 0;
    int ind2pop[200000];
    int pop2ind[200000];
    do {
        ind2pop[ptr]=cur;
        pop2ind[cur]=ptr;
        if (adjlist[cur][0]==pre){
            pre=cur;
            cur=adjlist[cur][1];
        } else {
            pre=cur;
            cur=adjlist[cur][0];
        }
        ptr++;
    } while (adjlist[cur].size()!=1);
    ind2pop[ptr]=cur;
    pop2ind[cur]=ptr;

    vector<int> ans(q);

    /*for (int i : ind2pop){
        cout<<i<<' ';
    }cout<<'\n';*/

    int lv = 0;
    int rv = 0;
    set<int> lvals;
    set<int> rvals;
    for (int i = 1; i<n; i++){
        rvals.insert(pop2ind[i]);
    }
    lvals.insert(-1);
    lvals.insert(n);
    rvals.insert(-1);
    rvals.insert(n);

    for (int i = 0; i<q; i++){
        int lii = l[inds[i]];
        if (lv<lii){
            while (lv<lii){
                lvals.insert(pop2ind[lv]);
                lv++;
            }
            lv--;
        } else if (lv>lii){
            while (lv>=lii){
                lvals.erase(pop2ind[lv]);
                lv--;
            }
            lv++;
        }
        int rii = r[inds[i]];
        if (rv<rii){
            while (rv<=rii){
                rvals.erase(pop2ind[rv]);
                rv++;
            }
            rv--;
        } else if (rv>rii){
            while (rv>rii){
                rvals.insert(pop2ind[rv]);
                rv--;
            }
            rv++;
        }

        /*cout<<"indices in l: ";
        for (int i : lvals){
            cout<<i<<' ';
        }cout<<'\n';

        cout<<"indices in r: ";
        for (int i : rvals){
            cout<<i<<' ';
        }cout<<'\n';*/
        auto lb1 = lvals.lower_bound(pop2ind[s[inds[i]]]);
        int ls = *(prev(lb1,1));
        int le = *lb1;
        auto lb2 = rvals.lower_bound(pop2ind[e[inds[i]]]);
        int rs = *(prev(lb2,1));
        int re = *(lb2);
        if (le<rs||re<ls){
            ans[inds[i]]=0;
        } else {
            ans[inds[i]]=1;
        }
    }

    return ans;
}

Compilation message (stderr)

werewolf.cpp: In function 'std::vector<int> check_validity(int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
werewolf.cpp:38:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for (int i = 0; i<x.size(); i++){
      |                     ~^~~~~~~~~
werewolf.cpp:54:9: warning: variable 'ind2pop' set but not used [-Wunused-but-set-variable]
   54 |     int ind2pop[200000];
      |         ^~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 8
• Subtask 3: 0 / 34
• Subtask 4: 0 / 51