Submission #311690

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
311690	2020-10-11 04:03:08	BeanZ	Railway (BOI17_railway)	C++14	100 / 100	279 ms	54796 KiB

railway

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// I_Love_LPL
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
const int N = 1e5 + 5;
const int lg = 17;
vector<pair<ll, ll>> node[N];
vector<ll> fuckoff[N];
vector<ll> ans;
ll dep[N], dp[N][18], up[N];
set<ll> st[N];
ll k;
ll LCA(ll u, ll v){
    if (dep[u] > dep[v]) swap(u, v);
    ll dis = dep[v] - dep[u];
    for (int i = lg; i >= 0; i--){
        if (dis & (1 << i)){
            v = dp[v][i];
        }
    }
    if (u == v) return u;
    for (int i = lg; i >= 0; i--){
        if (dp[u][i] != dp[v][i]){
            v = dp[v][i];
            u = dp[u][i];
        }
    }
    return dp[u][0];
 
 
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Compilation message (stderr)

railway.cpp: In function 'void dfs2(long long int, long long int)':
railway.cpp:40:22: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   40 |     if (st[u].size() >= k) ans.push_back(up[u]);
      |         ~~~~~~~~~~~~~^~~~
railway.cpp: In function 'int main()':
railway.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   56 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
railway.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   57 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25