Submission #902481

#	Time	Username	Problem	Language	Result	Execution time	Memory
902481		ALTAKEXE	Race (IOI11_race)	C++14	0 / 100	1 ms	2392 KiB

race

#include "race.h"
#include <bits/stdc++.h>
 
using namespace std;
typedef long long ll;
typedef long double ld;
#define all(v) v.begin(), v.end()
 
//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx2")
 
vector<vector<pair<int, int>>> adj;
int k;
 
pair<multiset<pair<int, int>>, int> dfs(int a, int p){
    multiset<pair<int, int>> cur;
    cur.insert({0, 0});
    int res = INT_MAX;
    vector<vector<pair<int, int>>> ch;
    for (auto [b, c] : adj[a]) {
        if(b == p) continue;
        ch.push_back({});
        auto [s, x] = dfs(b, a);
        res = min(res, x);
        for (auto &i : s) {
            ch.back().push_back({i.first + c, i.second + 1});
        }
    }
    for (auto &&i : ch) for (auto &&j : i) cur.insert(j);   
 
    for (auto &&i : ch) {
        for (auto &&j : i) cur.erase(cur.find(j));
        for (auto &&j : i) {
            if(cur.lower_bound({k - j.first, 0}) == cur.end()) continue;
            pair<int, int> x = *cur.lower_bound({k - j.first, 0});
            if(x.first == k - j.first){
                res = min(res, x.second + j.second);
            }
        }
        for (auto &&j : i) cur.insert(j);
    }
    return {cur, res};
}
 
int best_path(int N, int K, int H[][2], int L[])
{
    return -1;
}

Compilation message (stderr)

race.cpp: In function 'std::pair<std::multiset<std::pair<int, int> >, int> dfs(int, int)':
race.cpp:20:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   20 |     for (auto [b, c] : adj[a]) {
      |               ^
race.cpp:23:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   23 |         auto [s, x] = dfs(b, a);
      |              ^

• Subtask 1: 0 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 22
• Subtask 4: 0 / 57