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Submission #1099166

# Submission time Handle Problem Language Result Execution time Memory
1099166 2024-10-10T16:21:51 Z m5588ohammed Race (IOI11_race) C++14
9 / 100
 86 ms 31312 KB 
#include <bits/stdc++.h>
using namespace std;
#define MAX_N 300000
int n,k;
long long ans=1e6;
long long cnst1[MAX_N],cnst2[MAX_N];
vector <array<long long,2>> v[MAX_N];
set <array<long long,2>> nodes[MAX_N];
void dfs(long long i,long long last){
    if(v[i].size()==1&&i!=1){
        nodes[i].insert({0,0});
        return;
    }
    long long x,siz=0,c;
    for(auto [j,w]:v[i]){
        if(j==last) continue;
        dfs(j,i);
        if(nodes[j].size()>siz){
            siz=nodes[j].size();
            x=j;
            c=w;
        }
    }

    swap(nodes[i],nodes[x]);
    long long co=c,le=1;
    auto it=nodes[i].lower_bound({k-cnst1[x]-co,-1000000});
    if(it!=nodes[i].end()&&(*it)[0]==k-cnst1[x]-co){
        ans=min(ans,le+(*it)[1]+cnst2[x]);
    }
    cnst1[i]=cnst1[x]+c,cnst2[i]=cnst2[x]+1;
    nodes[i].insert({co-cnst1[i],le-cnst2[i]});

    for(auto [j,w]:v[i]){
        if(j==last||j==x) continue;
        for(auto [cost,len]:nodes[j]){
            co=cost+cnst1[j]+w,le=len+cnst2[j]+1;
            auto it=nodes[i].lower_bound({k-cnst1[i]-co,-1000000});
            if(it!=nodes[i].end()&&(*it)[0]==k-cnst1[i]-co){
                ans=min(ans,le+(*it)[1]+cnst2[i]);
            }
        }
        for(auto [cost,len]:nodes[j]){
            co=cost+cnst1[j]+w,le=len+cnst2[j]+1;
            nodes[i].insert({co-cnst1[i],le-cnst2[i]});
        }
        nodes[j].clear();
    }
    return;
}
int best_path(int N, int K, int H[][2], int L[])
{
    n=N;
    k=K;
    for(int i=0;i<n-1;i++){
        v[H[i][0]+1].push_back({H[i][1]+1,L[i]});
        v[H[i][1]+1].push_back({H[i][0]+1,L[i]});
    }
    dfs(1,0);
    if(ans!=1e6) return (int)ans;
    else return -1;
}
// signed main()
// {
//     ios_base::sync_with_stdio(false);
//     cin.tie(NULL);
//     cout.tie(NULL);
//     int N, K;
//     int H[MAX_N][2];
//     int L[MAX_N];
//     int solution;
//     cin>>N>>K;
//     for(int i=0;i<N-1;i++) cin>>H[i][0]>>H[i][1]>>L[i];
//     cout<<best_path(N,K,H,L)<<endl;
//     return 0;
// }

Compilation message

race.cpp: In function 'void dfs(long long int, long long int)':
race.cpp:15:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   15 |     for(auto [j,w]:v[i]){
      |              ^
race.cpp:18:27: warning: comparison of integer expressions of different signedness: 'std::set<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   18 |         if(nodes[j].size()>siz){
      |            ~~~~~~~~~~~~~~~^~~~
race.cpp:34:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   34 |     for(auto [j,w]:v[i]){
      |              ^
race.cpp:36:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   36 |         for(auto [cost,len]:nodes[j]){
      |                  ^
race.cpp:43:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   43 |         for(auto [cost,len]:nodes[j]){
      |                  ^
race.cpp:31:22: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |     cnst1[i]=cnst1[x]+c,cnst2[i]=cnst2[x]+1;
      |              ~~~~~~~~^~
race.cpp:14:15: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |     long long x,siz=0,c;
      |               ^

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 21596 KB Output is correct
2 Correct 9 ms 21596 KB Output is correct
3 Correct 9 ms 21468 KB Output is correct
4 Correct 10 ms 21624 KB Output is correct
5 Correct 9 ms 21408 KB Output is correct
6 Correct 8 ms 21640 KB Output is correct
7 Correct 8 ms 21596 KB Output is correct
8 Correct 8 ms 21584 KB Output is correct
9 Correct 10 ms 21632 KB Output is correct
10 Correct 10 ms 21596 KB Output is correct
11 Correct 10 ms 21460 KB Output is correct
12 Correct 9 ms 21592 KB Output is correct
13 Correct 9 ms 21588 KB Output is correct
14 Correct 8 ms 21592 KB Output is correct
15 Correct 9 ms 21596 KB Output is correct
16 Correct 8 ms 21596 KB Output is correct
17 Correct 9 ms 21596 KB Output is correct
18 Correct 8 ms 21596 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 21596 KB Output is correct
2 Correct 9 ms 21596 KB Output is correct
3 Correct 9 ms 21468 KB Output is correct
4 Correct 10 ms 21624 KB Output is correct
5 Correct 9 ms 21408 KB Output is correct
6 Correct 8 ms 21640 KB Output is correct
7 Correct 8 ms 21596 KB Output is correct
8 Correct 8 ms 21584 KB Output is correct
9 Correct 10 ms 21632 KB Output is correct
10 Correct 10 ms 21596 KB Output is correct
11 Correct 10 ms 21460 KB Output is correct
12 Correct 9 ms 21592 KB Output is correct
13 Correct 9 ms 21588 KB Output is correct
14 Correct 8 ms 21592 KB Output is correct
15 Correct 9 ms 21596 KB Output is correct
16 Correct 8 ms 21596 KB Output is correct
17 Correct 9 ms 21596 KB Output is correct
18 Correct 8 ms 21596 KB Output is correct
19 Correct 9 ms 21576 KB Output is correct
20 Correct 10 ms 21596 KB Output is correct
21 Correct 10 ms 21508 KB Output is correct
22 Incorrect 9 ms 21596 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 21596 KB Output is correct
2 Correct 9 ms 21596 KB Output is correct
3 Correct 9 ms 21468 KB Output is correct
4 Correct 10 ms 21624 KB Output is correct
5 Correct 9 ms 21408 KB Output is correct
6 Correct 8 ms 21640 KB Output is correct
7 Correct 8 ms 21596 KB Output is correct
8 Correct 8 ms 21584 KB Output is correct
9 Correct 10 ms 21632 KB Output is correct
10 Correct 10 ms 21596 KB Output is correct
11 Correct 10 ms 21460 KB Output is correct
12 Correct 9 ms 21592 KB Output is correct
13 Correct 9 ms 21588 KB Output is correct
14 Correct 8 ms 21592 KB Output is correct
15 Correct 9 ms 21596 KB Output is correct
16 Correct 8 ms 21596 KB Output is correct
17 Correct 9 ms 21596 KB Output is correct
18 Correct 8 ms 21596 KB Output is correct
19 Correct 86 ms 31072 KB Output is correct
20 Correct 75 ms 31312 KB Output is correct
21 Incorrect 76 ms 31068 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #4
0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 21596 KB Output is correct
2 Correct 9 ms 21596 KB Output is correct
3 Correct 9 ms 21468 KB Output is correct
4 Correct 10 ms 21624 KB Output is correct
5 Correct 9 ms 21408 KB Output is correct
6 Correct 8 ms 21640 KB Output is correct
7 Correct 8 ms 21596 KB Output is correct
8 Correct 8 ms 21584 KB Output is correct
9 Correct 10 ms 21632 KB Output is correct
10 Correct 10 ms 21596 KB Output is correct
11 Correct 10 ms 21460 KB Output is correct
12 Correct 9 ms 21592 KB Output is correct
13 Correct 9 ms 21588 KB Output is correct
14 Correct 8 ms 21592 KB Output is correct
15 Correct 9 ms 21596 KB Output is correct
16 Correct 8 ms 21596 KB Output is correct
17 Correct 9 ms 21596 KB Output is correct
18 Correct 8 ms 21596 KB Output is correct
19 Correct 9 ms 21576 KB Output is correct
20 Correct 10 ms 21596 KB Output is correct
21 Correct 10 ms 21508 KB Output is correct
22 Incorrect 9 ms 21596 KB Output isn't correct
23 Halted 0 ms 0 KB -