Submission #1069751

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069751		vjudge1	Petrol stations (CEOI24_stations)	C++17	18 / 100	113 ms	14916 KiB

Main

#include <bits/stdc++.h>
#define int long long

using namespace std;

const int MAX_N = 70000;

int ans[MAX_N], clones[MAX_N], k, n;
vector<vector<pair<int,int>>>adjL(MAX_N);
vector<int>vec;
vector<bool>visited;

int dfs(int pos, int fuel) {
    visited[pos] = 1;
    int tmp = 1;
    for(pair<int,int>p: adjL[pos]) {
        if(visited[p.first]) continue;
        if(fuel < p.second) {
            int X = dfs(p.first, k - p.second);
            ans[pos] += X;
            tmp += X;
        } else tmp += dfs(p.first, fuel - p.second);
    }
    return tmp;
}

void calc(int pos, int prev) {
    int cur;
    for(pair<int,int>p: adjL[pos]) {
        if(p.first == prev) continue;
        vec.push_back(vec.back() + p.second);
        cur = vec.back();
        calc(p.first, pos);
    }
    int brk = lower_bound(vec.begin(), vec.end(), cur + k) - vec.begin();
    if(brk == vec.size()) return;
    else {
        --brk;
        clones[brk] += clones[pos];
        ans[brk] += clones[pos];
    }
}

void solve() {
    cin >> n >> k;
    for(int i=0; i<n-1; ++i) {
        int u, v, w;
        cin >> u >> v >> w;
        adjL[u].push_back({v, w});
        adjL[v].push_back({u, w});
    }
    if(n <= 1000) {
        for(int i=0; i<n; ++i) {
            visited.assign(n, 0);
            dfs(i, k);
        }
    } else {
        for(int i=0; i<n; ++i) clones[i] = 1;
        vec.push_back(0);
        for(int i=0; i<n; ++i) {
            if(adjL[i].size() == 1) {
                calc(i, i);
                break;
            }
        }
    }
    for(int i=0; i<n; ++i) cout << ans[i] << endl;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    int t = 1;
    while(t--) solve();
}

Compilation message (stderr)

Main.cpp: In function 'void calc(long long int, long long int)':
Main.cpp:36:12: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     if(brk == vec.size()) return;
      |        ~~~~^~~~~~~~~~~~~
Main.cpp:35:55: warning: 'cur' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |     int brk = lower_bound(vec.begin(), vec.end(), cur + k) - vec.begin();
      |                                                   ~~~~^~~

• Subtask 0: 0 / 0
• Subtask 1: 18 / 18
• Subtask 2: 0 / 8
• Subtask 3: 0 / 10
• Subtask 4: 0 / 12
• Subtask 5: 0 / 17
• Subtask 6: 0 / 35