oj.uz

답안 #132529

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
132529 2019-07-19T06:23:14 Z Just_Solve_The_Problem Election Campaign (JOI15_election_campaign) C++11
10 / 100
 870 ms 19932 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = (int)1e5 + 7;

vector <int> gr[N];
int n, m;
vector <tuple<int, int, int>> vec;
int tin[N], tout[N], lc[17][N];
int tiktak;
vector <int> order;

void dfs(int v, int pr) {
  tin[v] = ++tiktak;
  lc[0][v] = pr;
  order.push_back(v);
  for (int i = 1; i < 17; i++) {
    lc[i][v] = lc[i - 1][lc[i - 1][v]];
  }
  for (int to : gr[v]) {
    if (to == pr) continue;
    dfs(to, v);
  }
  order.push_back(v);
  tout[v] = ++tiktak;
}

bool upper(int a, int b) {
  return tin[a] <= tin[b] && tout[a] >= tout[b];
}

int lca(int a, int b) {
  if (upper(a, b)) return a;
  if (upper(b, a)) return b;
  for (int i = 16; i >= 0; i--) {
    if (!upper(lc[i][a], b)) a = lc[i][a];
  }
  return lc[0][a];
}

bool check(int i, int j) {
  int a, b, c, d, val = 0;
  tie(a, b) = make_tuple(get<0>(vec[i]), get<1>(vec[i]));
  tie(c, d) = make_tuple(get<0>(vec[j]), get<1>(vec[j]));
  int lc = lca(c, d);
  if (upper(a, b)) {
    val = (tin[a] <= tin[c] && tin[c] <= tin[b]);
    val ^= (tin[a] <= tout[c] && tout[c] <= tin[b]);
    if (val) return 0;
    val = (tin[a] <= tin[d] && tin[d] <= tin[b]);
    val ^= (tin[a] <= tout[d] && tout[d] <= tin[b]);
    if (val) return 0;
    val = (tin[a] <= tin[lc] && tin[lc] <= tin[b]);
    val ^= (tin[a] <= tout[lc] && tout[lc] <= tin[b]);
    if (val) return 0;
  } else {
    val = (tout[a] <= tin[c] && tin[c] <= tin[b]);
    val ^= (tout[a] <= tout[c] && tout[c] <= tin[b]);
    if (val) return 0;
    val = (tout[a] <= tin[d] && tin[d] <= tin[b]);
    val ^= (tout[a] <= tout[d] && tout[d] <= tin[b]);
    if (val) return 0;
    val = (tout[a] <= tin[lc] && tin[lc] <= tin[b]);
    val ^= (tout[a] <= tout[lc] && tout[lc] <= tin[b]);
    if (val) return 0;
    int lc1 = lca(a, b);
    if (lc1 == a || lc1 == b || lc1 == lc) return 0;
  }
  return 1;
}

int ans;

main() {
  scanf("%d", &n);
  for (int i = 1; i < n; i++) {
    int u, v;
    scanf("%d %d", &u, &v);
    gr[u].push_back(v);
    gr[v].push_back(u);
  }
  dfs(1, 1);
  scanf("%d", &m);
  for (int i = 0; i < m; i++) {
    int u, v, w;
    scanf("%d %d %d", &u, &v, &w);
    if (tin[u] > tin[v]) swap(u, v);
    vec.push_back({u, v, w});
  }
  for (int mask = 1; mask < (1 << m); mask++) {
    vector <int> v;
    for (int j = 0; j < m; j++) {
      if ((mask >> j) & 1) {
        v.push_back(j);
      }
    }
    bool ok = 1;
    for (int i = 0; i < v.size(); i++) {
      for (int j = 0; j < v.size(); j++) {
        if (i == j) continue;
        ok &= check(v[i], v[j]);
      }
    }
    if (ok) {
      int res = 0;
      for (int &to : v) {
        res += get<2>(vec[to]);
      }
      ans = max(ans, res);
    }
  }
  printf("%d\n", ans);
}

Compilation message

election_campaign.cpp:75:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:99:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < v.size(); i++) {
                     ~~^~~~~~~~~~
election_campaign.cpp:100:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int j = 0; j < v.size(); j++) {
                       ~~^~~~~~~~~~
election_campaign.cpp:76:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~
election_campaign.cpp:79:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &u, &v);
     ~~~~~^~~~~~~~~~~~~~~~~
election_campaign.cpp:84:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &m);
   ~~~~~^~~~~~~~~~
election_campaign.cpp:87:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &u, &v, &w);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2936 KB Output is correct
2 Correct 4 ms 2808 KB Output is correct
3 Correct 4 ms 2808 KB Output is correct
4 Correct 91 ms 2808 KB Output is correct
5 Correct 551 ms 15728 KB Output is correct
6 Correct 186 ms 19932 KB Output is correct
7 Correct 309 ms 18648 KB Output is correct
8 Correct 528 ms 16080 KB Output is correct
9 Correct 313 ms 17524 KB Output is correct
10 Correct 464 ms 15984 KB Output is correct

Subtask #2
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2808 KB Output is correct
2 Incorrect 4 ms 2808 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2808 KB Output is correct
2 Incorrect 4 ms 2808 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 141 ms 18640 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2936 KB Output is correct
2 Correct 4 ms 2808 KB Output is correct
3 Correct 4 ms 2808 KB Output is correct
4 Correct 91 ms 2808 KB Output is correct
5 Correct 551 ms 15728 KB Output is correct
6 Correct 186 ms 19932 KB Output is correct
7 Correct 309 ms 18648 KB Output is correct
8 Correct 528 ms 16080 KB Output is correct
9 Correct 313 ms 17524 KB Output is correct
10 Correct 464 ms 15984 KB Output is correct
11 Incorrect 870 ms 2956 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2936 KB Output is correct
2 Correct 4 ms 2808 KB Output is correct
3 Correct 4 ms 2808 KB Output is correct
4 Correct 91 ms 2808 KB Output is correct
5 Correct 551 ms 15728 KB Output is correct
6 Correct 186 ms 19932 KB Output is correct
7 Correct 309 ms 18648 KB Output is correct
8 Correct 528 ms 16080 KB Output is correct
9 Correct 313 ms 17524 KB Output is correct
10 Correct 464 ms 15984 KB Output is correct
11 Correct 4 ms 2808 KB Output is correct
12 Incorrect 4 ms 2808 KB Output isn't correct
13 Halted 0 ms 0 KB -