oj.uz

답안 #621331

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
621331 2022-08-03T17:30:11 Z Jomnoi 늑대인간 (IOI18_werewolf) C++17
15 / 100
 1209 ms 63872 KB 
#include <bits/stdc++.h>
#include "werewolf.h"
using namespace std;

const int MAX_N = 2e5 + 5;

int N, M, Q;
vector <int> graph[MAX_N];
bool visited[MAX_N][2];
vector <int> order;
int enpos[MAX_N];
int tmax[MAX_N][20], tmin[MAX_N][20];

int getMin(int l, int r) {
    int j = log2(r - l + 1);
    return min(tmin[l][j], tmin[r - (1<<j) + 1][j]);
}

int getMax(int l, int r) {
    int j = log2(r - l + 1);
    return max(tmax[l][j], tmax[r - (1<<j) + 1][j]);
}

void dfs(int u, int p) {
    order.push_back(u);
    for(auto v : graph[u]) {
        if(v != p) {
            dfs(v, u);
        }
    }
}

vector <int> check_validity(int n, vector <int> X, vector <int> Y, vector <int> S, vector <int> E, vector <int> L, vector <int> R) {
    N = n, Q = S.size(), M = X.size();
    vector <int> answer(Q, 0);
    for(int i = 0; i < M; i++) {
        graph[X[i]].push_back(Y[i]);
        graph[Y[i]].push_back(X[i]);
    }

    if(N <= 3000 and M <= 6000 and Q <= 3000) {
        for(int qq = 0; qq < Q; qq++) {
            int s = S[qq], e = E[qq], l = L[qq], r = R[qq];
            for(int i = 0; i < N; i++) {
                visited[i][0] = false;
                visited[i][1] = false;
            }

            queue <pair <int, int>> q;
            if(s >= l) {
                q.emplace(s, 0);
                visited[s][0] = true;
            }
            while(!q.empty()) {
                auto [u, k] = q.front();
                q.pop();

                if(k == 0 and l <= u and u <= r and visited[u][1] == false) {
                    visited[u][1] = true;
                    q.emplace(u, 1);
                }
                for(auto v : graph[u]) {
                    if(k == 0) {
                        if(v >= l and visited[v][0] == false) {
                            visited[v][0] = true;
                            q.emplace(v, 0);
                        }
                    }
                    else {
                        if(v <= r and visited[v][1] == false) {
                            visited[v][1] = true;
                            q.emplace(v, 1);   
                        }
                    }
                }
            }

            answer[qq] = visited[e][1];
        }
    }
    else {
        for(int i = 0; i < N; i++) {
            if(graph[i].size() == 1) {
                dfs(i, -1);
                break;
            }
        }
        for(int i = 0; i < N; i++) {
            enpos[order[i]] = i;
            tmin[i][0] = order[i];
            tmax[i][0] = order[i];
        }
        for(int j = 1; j < 20; j++) {
            for(int i = 0; i + (1<<j) - 1 < N; i++) {
                tmin[i][j] = min(tmin[i][j - 1], tmin[i + (1<<(j - 1))][j - 1]);
                tmax[i][j] = max(tmax[i][j - 1], tmax[i + (1<<(j - 1))][j - 1]);
            }
        }

        for(int qq = 0; qq < Q; qq++) {
            int s = S[qq], e = E[qq], ll = L[qq], rr = R[qq];
            int l, r, mid, sR, sL, eR, eL;
 
            l = 0, r = enpos[order[s]];
            while(l <= r) {
                mid = (l + r) / 2;

                if(getMin(mid, enpos[order[s]]) >= ll) {
                    r = mid - 1;
                    sL = mid;
                }
                else {
                    l = mid + 1;
                }
            }
            l = enpos[order[s]], r = N - 1;
            while(l <= r) {
                mid = (l + r) / 2;

                if(getMin(enpos[order[s]], mid) >= ll) {
                    l = mid + 1;
                    sR = mid;
                }
                else {
                    r = mid - 1;
                }
            }
            l = 0, r = enpos[order[e]];
            while(l <= r) {
                mid = (l + r) / 2;

                if(getMax(mid, enpos[order[e]]) <= rr) {
                    r = mid - 1;
                    eL = mid;
                }
                else {
                    l = mid + 1;
                }
            }
            l = enpos[order[e]], r = N - 1;
            while(l <= r) {
                mid = (l + r) / 2;
                
                if(getMax(enpos[order[e]], mid) <= rr) {
                    l = mid + 1;
                    eR = mid;
                }
                else {
                    r = mid - 1;
                }
            }

            if((sR - sL + 1) + (eR - eL + 1) > (max(sR, eR) - min(sL, eL) + 1)) {
                answer[qq] = 1;
            }
        }
    }
    return answer;
}

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:102:36: warning: 'eR' may be used uninitialized in this function [-Wmaybe-uninitialized]
  102 |             int l, r, mid, sR, sL, eR, eL;
      |                                    ^~
werewolf.cpp:102:40: warning: 'eL' may be used uninitialized in this function [-Wmaybe-uninitialized]
  102 |             int l, r, mid, sR, sL, eR, eL;
      |                                        ^~
werewolf.cpp:102:28: warning: 'sR' may be used uninitialized in this function [-Wmaybe-uninitialized]
  102 |             int l, r, mid, sR, sL, eR, eL;
      |                            ^~
werewolf.cpp:102:32: warning: 'sL' may be used uninitialized in this function [-Wmaybe-uninitialized]
  102 |             int l, r, mid, sR, sL, eR, eL;
      |                                ^~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4952 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 4 ms 4948 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4952 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 4 ms 4948 KB Output is correct
10 Correct 369 ms 5260 KB Output is correct
11 Correct 243 ms 5268 KB Output is correct
12 Correct 23 ms 5256 KB Output is correct
13 Correct 314 ms 5272 KB Output is correct
14 Correct 212 ms 5252 KB Output is correct
15 Correct 233 ms 5332 KB Output is correct

Subtask #3
0 / 34.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1209 ms 63872 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4952 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 4 ms 4948 KB Output is correct
10 Correct 369 ms 5260 KB Output is correct
11 Correct 243 ms 5268 KB Output is correct
12 Correct 23 ms 5256 KB Output is correct
13 Correct 314 ms 5272 KB Output is correct
14 Correct 212 ms 5252 KB Output is correct
15 Correct 233 ms 5332 KB Output is correct
16 Incorrect 1209 ms 63872 KB Output isn't correct
17 Halted 0 ms 0 KB -