oj.uz

답안 #223383

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
223383 2020-04-15T08:30:05 Z cheeheng Klasika (COCI20_klasika) C++14
33 / 110
 5000 ms 27024 KB 
#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> ii;

vector<ii> AdjList[200005];

char str[8];

int dist[200005];

int op[200005];
int X[200005];
int Y[200005];

int p[200005][20];
int depth[200005];

int lca(int a, int b){
    if(depth[a] < depth[b]){
        swap(a, b);
    }

    for(int k = 19; k >= 0; k --){
        if(p[a][k] == -1){continue;}
        if(depth[p[a][k]] >= depth[b]){
            a = p[a][k];
        }
    }

    if(a == b){return a;}
    for(int k = 19; k >= 0; k --){
        if(p[a][k] != p[b][k]){
            a = p[a][k];
            b = p[b][k];
        }
    }

    return p[a][0];
}

bool visited[200005];

void dfs(int u, int p2, int dist1, int d){
    if(visited[u]){
        return;
    }
    dist[u] = dist1;
    depth[u] = d;
    visited[u] = true;
    p[u][0] = p2;

    for(ii v2: AdjList[u]){
        int v = v2.first;
        if(!visited[v]){
            dfs(v, u, dist1^v2.second, d+1);
        }
    }
}

int main(){
    int Q;
    scanf("%d", &Q);

    int N = 1;
    for(int i = 0; i < Q; i ++){
        memset(str, 0, sizeof(str));
        int a, b;
        scanf(" %s %d %d", str, &a, &b);

        if(str[0] == 'A'){
            op[i] = 0;
        }else if(str[0] == 'Q'){
            op[i] = 1;
        }else{
            throw;
        }
        X[i] = a;
        Y[i] = b;
        if(op[i] == 0){
            N ++;
            AdjList[a].push_back(ii(N, b));
            AdjList[N].push_back(ii(a, b));
        }
    }

    memset(p, -1, sizeof(p));
    memset(visited, 0, sizeof(visited));

    dfs(1, -1, 0, 0);

    for(int k = 1; k <= 19; k ++){
        for(int i = 1; i <= N; i ++){
            if(p[i][k-1] == -1){
                p[i][k] = -1;
            }else{
                p[i][k] = p[p[i][k-1]][k-1];
            }
        }
    }

    int m = 1;
    for(int i = 0; i < Q; i ++){
        if(op[i] == 0){
            m ++;
        }else{
            int ans = 0;
            //printf("m=%d, X[i]=%d, Y[i]=%d\n", m, X[i], Y[i]);
            for(int j = 1; j <= m; j ++){
                //printf("lca(%d, %d)=%d\n", Y[i], j, lca(Y[i], j));
                if(lca(Y[i], j) == Y[i]){
                    //printf("%d and %d considered\n", j, X[i]);
                    ans = max(ans, dist[X[i]]^dist[j]);
                }
            }
            printf("%d\n", ans);
        }
    }

    return 0;
}

Compilation message

klasika.cpp: In function 'int main()':
klasika.cpp:63:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &Q);
     ~~~~~^~~~~~~~~~
klasika.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf(" %s %d %d", str, &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 20864 KB Output is correct
2 Correct 16 ms 20864 KB Output is correct
3 Correct 16 ms 20992 KB Output is correct
4 Correct 16 ms 20864 KB Output is correct
5 Correct 16 ms 20864 KB Output is correct
6 Correct 16 ms 20864 KB Output is correct
7 Correct 16 ms 20864 KB Output is correct
8 Correct 16 ms 20864 KB Output is correct
9 Correct 16 ms 20864 KB Output is correct
10 Correct 16 ms 20864 KB Output is correct
11 Correct 16 ms 20864 KB Output is correct
12 Correct 15 ms 20864 KB Output is correct

Subtask #2
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 20864 KB Output is correct
2 Correct 16 ms 20864 KB Output is correct
3 Correct 16 ms 20992 KB Output is correct
4 Correct 16 ms 20864 KB Output is correct
5 Correct 16 ms 20864 KB Output is correct
6 Correct 16 ms 20864 KB Output is correct
7 Correct 16 ms 20864 KB Output is correct
8 Correct 16 ms 20864 KB Output is correct
9 Correct 16 ms 20864 KB Output is correct
10 Correct 16 ms 20864 KB Output is correct
11 Correct 16 ms 20864 KB Output is correct
12 Correct 15 ms 20864 KB Output is correct
13 Correct 36 ms 20992 KB Output is correct
14 Correct 45 ms 20992 KB Output is correct
15 Correct 45 ms 20992 KB Output is correct
16 Correct 37 ms 20992 KB Output is correct
17 Correct 46 ms 20984 KB Output is correct
18 Correct 62 ms 20992 KB Output is correct
19 Correct 60 ms 20992 KB Output is correct
20 Correct 47 ms 20992 KB Output is correct
21 Correct 46 ms 20992 KB Output is correct
22 Correct 64 ms 20992 KB Output is correct
23 Correct 65 ms 20992 KB Output is correct
24 Correct 48 ms 20992 KB Output is correct

Subtask #3
0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 5057 ms 27024 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 20864 KB Output is correct
2 Correct 16 ms 20864 KB Output is correct
3 Correct 16 ms 20992 KB Output is correct
4 Correct 16 ms 20864 KB Output is correct
5 Correct 16 ms 20864 KB Output is correct
6 Correct 16 ms 20864 KB Output is correct
7 Correct 16 ms 20864 KB Output is correct
8 Correct 16 ms 20864 KB Output is correct
9 Correct 16 ms 20864 KB Output is correct
10 Correct 16 ms 20864 KB Output is correct
11 Correct 16 ms 20864 KB Output is correct
12 Correct 15 ms 20864 KB Output is correct
13 Correct 36 ms 20992 KB Output is correct
14 Correct 45 ms 20992 KB Output is correct
15 Correct 45 ms 20992 KB Output is correct
16 Correct 37 ms 20992 KB Output is correct
17 Correct 46 ms 20984 KB Output is correct
18 Correct 62 ms 20992 KB Output is correct
19 Correct 60 ms 20992 KB Output is correct
20 Correct 47 ms 20992 KB Output is correct
21 Correct 46 ms 20992 KB Output is correct
22 Correct 64 ms 20992 KB Output is correct
23 Correct 65 ms 20992 KB Output is correct
24 Correct 48 ms 20992 KB Output is correct
25 Execution timed out 5057 ms 27024 KB Time limit exceeded
26 Halted 0 ms 0 KB -