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Submission #919094

# Submission time Handle Problem Language Result Execution time Memory
919094 2024-01-31T08:39:31 Z velislavgarkov Highway Tolls (IOI18_highway) C++14
5 / 100
 119 ms 8820 KB 
#include "highway.h"
#include <iostream>
#include <vector>
using namespace std;
const int MAXN=1e5+10;
vector <pair <int,int> > v[MAXN], dist;
vector <int> w;
int edge;
long long a, b, path;
int n;
void find_tree(int x, int par) {
    for (auto i:v[x]) {
        if (i.second==edge) continue;
        if (i.first==par) continue;
        w[i.second]=1;
        find_tree(i.first,x);
    }
}
void dfs(int x, int par, int d) {
    for (auto i:v[x]) {
        if (i.second==edge) continue;
        if (i.first==par) continue;
        if (d==1) {
            dist.push_back(i);
            continue;
        }
        dfs(i.first,x,d-1);
    }
}
int find_one(int start) {
    for (int i=0;i<n-1;i++) w[i]=0;
    find_tree(start,start);
    long long d=path/a;
    if (d==0) return start;
    if (!dist.empty()) dist.clear();
    dfs(start,start,d);
    if (dist.empty()) return 1/0;
    int l, r, mid;
    l=0; r=dist.size()-1;
    while (l<r) {
        mid=(l+r)/2;
        for (int i=0;i<n-1;i++) w[i]=0;
        for (int i=l;i<=mid;i++) w[dist[i].second]=1;
        int cur=ask(w);
        if (cur==path) l=mid+1;
        else r=mid;
    }
    return dist[l].first;
}
void find_pair (int N, vector <int> U, vector <int> V, int A, int B) {
    n=N; a=A; b=B;
    w.resize(n-1);
    for (int i=0;i<n-1;i++) {
        v[U[i]].push_back({V[i],i});
        v[V[i]].push_back({U[i],i});
    }
    for (int i=0;i<n-1;i++) w[i]=0;
    path=ask(w);
    //cout << path << endl;
    edge=-1;
    int ans1, ans2;
    /*
    int l, r, mid;
    l=0; r=n-1;
    while (l<r) {
        mid=(l+r)/2;
        for (int i=0;i<n-1;i++) w[i]=0;
        for (int i=l;i<=mid;i++) w[i]=1;
        int cur=ask(w);
        if (cur==path) l=mid+1;
        else r=mid;
    }
    edge=l;
    //cout << U[edge] << ' ' << V[edge] << endl;
    ans1=find_one(U[edge]);
    ans2=find_one(V[edge]);*/
    ans1=0;
    ans2=find_one(0);
    answer(ans1,ans2);    
}

Compilation message

highway.cpp: In function 'int find_one(int)':
highway.cpp:37:31: warning: division by zero [-Wdiv-by-zero]
   37 |     if (dist.empty()) return 1/0;
      |                              ~^~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2904 KB Output is correct
2 Correct 1 ms 2792 KB Output is correct
3 Correct 1 ms 2648 KB Output is correct
4 Correct 1 ms 2784 KB Output is correct
5 Correct 1 ms 2648 KB Output is correct
6 Correct 1 ms 2788 KB Output is correct
7 Correct 1 ms 2648 KB Output is correct
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2792 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 1 ms 2648 KB Output is correct
12 Correct 1 ms 2648 KB Output is correct

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2848 KB Output is correct
2 Correct 13 ms 3400 KB Output is correct
3 Correct 119 ms 8136 KB Output is correct
4 Correct 78 ms 8112 KB Output is correct
5 Correct 77 ms 8116 KB Output is correct
6 Correct 81 ms 7968 KB Output is correct
7 Correct 79 ms 8044 KB Output is correct
8 Correct 74 ms 8256 KB Output is correct
9 Correct 79 ms 8156 KB Output is correct
10 Correct 97 ms 8124 KB Output is correct
11 Correct 86 ms 8388 KB Output is correct
12 Correct 88 ms 8820 KB Output is correct
13 Correct 68 ms 8464 KB Output is correct
14 Incorrect 91 ms 8552 KB Output is incorrect: {s, t} is wrong.
15 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 3600 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2844 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 3112 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Incorrect 14 ms 3160 KB Incorrect
2 Halted 0 ms 0 KB -