Submission #295752

#	Time	Username	Problem	Language	Result	Execution time	Memory
295752		eohomegrownapps	Werewolf (IOI18_werewolf)	C++14	0 / 100	388 ms	54520 KiB

werewolf

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

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

vector<vector<int>> adjlist;

bool comp_l(int a, int b){
    return l[a]<=l[b];
}

bool comp_r(int a, int b){
    return r[a]>=r[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;

    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 pop2ind[200000];
    int ind2pop[200000];
    do {
        pop2ind[cur]=ptr;
        ind2pop[ptr]=cur;
        if (adjlist[cur][0]==pre){
            pre=cur;
            cur=adjlist[cur][1];
        } else {
            pre=cur;
            cur=adjlist[cur][0];
        }
        ptr++;
    } while (adjlist[cur].size()!=1);
    pop2ind[cur]=ptr;
    ind2pop[ptr]=cur;

    /*for (int i = 0; i<n; i++){
        cout<<ind2pop[i]<<' ';
    }cout<<'\n';*/

    vector<int> intsl(q);
    vector<int> intsr(q);

    vector<int> intel(q);
    vector<int> inter(q);

    vector<int> inds(q);
    for (int i = 0; i<q; i++){
        inds[i]=i;
    }
    sort(inds.begin(), inds.end(), comp_l);
    
    int prevl = 0;
    set<int> lpoints;
    lpoints.insert(-1);
    lpoints.insert(n);

    for (int i = 0; i<q; i++){
        while (prevl<l[inds[i]]){
            lpoints.insert(pop2ind[prevl]);
            prevl++;
        }
        auto lb = lpoints.lower_bound(pop2ind[s[inds[i]]]);
        intsl[inds[i]]=*(prev(lb))+1;
        intsr[inds[i]]=*lb-1;
    }

    int prevr = n-1;
    set<int> rpoints;
    rpoints.insert(-1);
    rpoints.insert(n);

    for (int i = 0; i<q; i++){
        while (prevr>r[inds[i]]){
            rpoints.insert(pop2ind[prevr]);
            prevr--;
        }
        auto lb = rpoints.lower_bound(pop2ind[e[inds[i]]]);
        intel[inds[i]]=*(prev(lb))+1;
        inter[inds[i]]=*lb-1;
    }

    vector<int> ans(q);
    for (int i = 0; i<q; i++){
        //cout<<"human: "<<intsl[i]<<' '<<intsr[i]<<'\n';
        //cout<<"werewolf: "<<intel[i]<<' '<<inter[i]<<'\n';
        if (!(inter[i]<intsl[i]||intsr[i]<intel[i])){
            ans[i]=1;
        } else {
            ans[i]=0;
        }
    }

    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:26:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     for (int i = 0; i<x.size(); i++){
      |                     ~^~~~~~~~~
werewolf.cpp:43:9: warning: variable 'ind2pop' set but not used [-Wunused-but-set-variable]
   43 |     int ind2pop[200000];
      |         ^~~~~~~

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