oj.uz

답안 #580805

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
580805 2022-06-21T21:09:13 Z definitelynotmee 늑대인간 (IOI18_werewolf) C++17
15 / 100
 459 ms 62140 KB 
#include "werewolf.h"
#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template<typename T>
using matrix = vector<vector<T>>;

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) {
    
    matrix<int> g(N);
    for(int i = 0; i < X.size(); i++){
        g[X[i]].push_back(Y[i]);
        g[Y[i]].push_back(X[i]);
    }
    int Q = S.size();
    std::vector<int> ans(Q);
    
    if(N <= 3000){
        
        vector<int> c1(N), c2(N);
        auto dfs =[&](int id, int l, int r,vector<int>&check, auto dfs)->void{
            check[id] = 1;
            for(int i : g[id]){
                if(check[i] || i > r || i < l)
                    continue;
                dfs(i,l,r,check,dfs);
            }
        };

        for(int i = 0; i < Q; i++){
            fill(all(c1),0);
            fill(all(c2),0);
            dfs(S[i],L[i],N,c1,dfs);
            dfs(E[i],0,R[i],c2,dfs);
            for(int j = 0; j < N; j++){
                ans[i]|=c1[j]&&c2[j];
            }
        }
    } else {
        vector<int> v;
        v.reserve(N);
        auto dfs =[&](int id, int last, auto dfs)->void{
            for(int i : g[id])
                if(i != last) dfs(i,id,dfs);
            v.push_back(id);
        };
        for(int i = 0; i < N; i++){
            if(g[i].size() == 1){
                dfs(i,-1,dfs);
                break;
            }
        }
        vector<int> inv(N);
        for(int i = 0; i < N; i++)
            inv[v[i]] = i;
        
        matrix<int> smin(20,vector<int>(N)), smax(20,vector<int>(N));
        for(int i = 0; i < N; i++)
            smin[0][i] = v[i], smax[0][i] = v[i];
        
        for(int i = 1; i < 20; i++){
            for(int j = 0; j+(1<<i) <= N; i++){
                smin[i][j] = min(smin[i-1][j],smin[i-1][j+(1<<i-1)]);
                smax[i][j] = max(smax[i-1][j],smax[i-1][j+(1<<i-1)]);
            }
        }

        auto qmin =[&](int l, int r){
            int logg = log2(r-l+1);
            return min(smin[logg][l],smin[logg][r-(1<<logg)+1]);
        };
        auto qmax =[&](int l, int r){
            int logg = log2(r-l+1);
            return max(smax[logg][l],smax[logg][r-(1<<logg)+1]);
        };

        for(int i = 0; i < Q; i++){
            int a = inv[S[i]], b = inv[E[i]];
            if(a < b){
                int ini = a, fim = b;
                while(ini!=fim){
                    //cout << 'a'<< ini << ' ' << fim << endl;
                    int m = (ini+fim+1)>>1;
                    if(qmin(a,m) >= L[i])
                        ini = m;
                    else fim = m-1;
                }
                //cout << "a->" << ini << '\n';
                ans[i] = qmax(ini,b) <= R[i];
            } else {
                int ini = b, fim = a;
                while(ini!=fim){
                    //cout <<'b'<< ini << ' ' << fim << endl;
                    int m = (ini+fim)>>1;
                    if(qmin(m,a) >= L[i])
                        fim = m;
                    else ini = m+1;
                }
                //cout << "b->" << ini << '\n';
                ans[i] = qmax(b,ini) <= R[i];
            }
        }
    }
    
    return ans;
}

Compilation message

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:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(int i = 0; i < X.size(); i++){
      |                    ~~^~~~~~~~~~
werewolf.cpp:70:64: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   70 |                 smin[i][j] = min(smin[i-1][j],smin[i-1][j+(1<<i-1)]);
      |                                                               ~^~
werewolf.cpp:71:64: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   71 |                 smax[i][j] = max(smax[i-1][j],smax[i-1][j+(1<<i-1)]);
      |                                                               ~^~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 271 ms 628 KB Output is correct
11 Correct 168 ms 620 KB Output is correct
12 Correct 26 ms 692 KB Output is correct
13 Correct 301 ms 640 KB Output is correct
14 Correct 207 ms 596 KB Output is correct
15 Correct 265 ms 728 KB Output is correct

Subtask #3
0 / 34.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 459 ms 62140 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 271 ms 628 KB Output is correct
11 Correct 168 ms 620 KB Output is correct
12 Correct 26 ms 692 KB Output is correct
13 Correct 301 ms 640 KB Output is correct
14 Correct 207 ms 596 KB Output is correct
15 Correct 265 ms 728 KB Output is correct
16 Incorrect 459 ms 62140 KB Output isn't correct
17 Halted 0 ms 0 KB -