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Submission #1099198

# Submission time Handle Problem Language Result Execution time Memory
1099198 2024-10-10T17:22:27 Z MMihalev Highway Tolls (IOI18_highway) C++14
51 / 100
 160 ms 18400 KB 
#include "highway.h"
#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
using namespace std;
const int MAX_N=90005;
int q;
int remedges;
int n,m;
vector<int>w;
vector<pair<int,int> >g[MAX_N],G[MAX_N];
long long edges,cost;
int root;
int a,b;
int parent[MAX_N];
int paredge[MAX_N];
int depth[MAX_N];
vector<int>ENDS;
vector<pair<int,int>>nodes;
bool used[MAX_N];
bool usededge[130010];
void initbfs()
{
    queue<int>q;
    q.push(root);
    used[root]=1;

    while(q.size())
    {
        int u=q.front();
        q.pop();

        for(auto [v,edge]:G[u])
        {
            if(used[v])continue;

            used[v]=1;
            usededge[edge]=1;
            g[u].push_back({v,edge});
            g[v].push_back({u,edge});
            parent[v]=u;
            paredge[v]=edge;
            depth[v]=depth[u]+1;
            q.push(v);
        }
    }
}
int onpath()
{
    int l=0,r=n-1;
    int ans;

    while(l<=r)
    {
        int mid=(l+r)/2;
        for(int u=0;u<=mid;u++)
        {
            for(auto [v,edge]:G[u])
            {
                w[edge]=1;
            }
        }
        long long ncost=ask(w);q++;
        for(int u=0;u<=mid;u++)
        {
            for(auto [v,edge]:G[u])
            {
                w[edge]=0;
            }
        }
        if(ncost!=cost)
        {
            ans=mid;
            r=mid-1;
            if(remedges!=edges)return ans;
        }
        else l=mid+1;
    }

    return ans;
}
void nodesdfs(int u)
{
    if(remedges==edges)
    {
        if(depth[u]<=remedges)nodes.push_back({depth[u],u});
    }
    else if(depth[u]==remedges)nodes.push_back({depth[u],u});

    for(auto [v,edge]:g[u])
    {
        if(v==parent[u])continue;

        nodesdfs(v);
    }
}
int rec(int l,int r)
{
    if(l==r)
    {
        return nodes[l].second;
    }

    int mid=(l+r)/2;

    for(int i=l;i<=mid;i++)
    {
        w[paredge[nodes[i].second]]=1;
    }
    long long ncost=ask(w);q++;
    for(int i=l;i<=mid;i++)
    {
        w[paredge[nodes[i].second]]=0;
    }

    if(ncost!=cost)return rec(l,mid);
    return rec(mid+1,r);
}
void solve(int branch,bool with)
{
    nodes.clear();
    for(int i=0;i<g[root].size();i++)
    {
        if(with)
        {
            if(i!=branch)continue;
        }
        else
        {
            if(i==branch)continue;
        }

        nodesdfs(g[root][i].first);
    }
    sort(nodes.rbegin(),nodes.rend());
    ENDS.push_back(rec(0,nodes.size()-1));
}
int solvetwo()
{
    int l=0,r=g[root].size()-1;
    int ans=-1;

    while(l<=r)
    {
        int mid=(l+r)/2;

        for(int i=0;i<=mid;i++)
        {
            w[g[root][i].second]=1;
        }
        long long ncost=ask(w);q++;
        for(int i=0;i<=mid;i++)
        {
            w[g[root][i].second]=0;
        }

        if(ncost!=cost)
        {
            ans=mid;
            r=mid-1;
        }
        else l=mid+1;
    }

    return ans;
}
void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B)
{
    n=N;
    m=U.size();
    w.resize(m);
    a=A;
    b=B;

    for(int i=0;i<m;i++)
    {
        G[U[i]].push_back({V[i],i});
        G[V[i]].push_back({U[i],i});
    }

    cost=ask(w);q++;
    edges=cost/a;
    remedges=edges;

    root=onpath();
    initbfs();
    for(int i=0;i<m;i++)
    {
        if(usededge[i])continue;
        w[i]=1;
    }

    int branch=solvetwo();
    solve(branch,1);
    if(depth[ENDS[0]]==edges)
    {
        ENDS.push_back(root);
    }
    else
    {
        remedges-=depth[ENDS[0]];
        solve(branch,0);
    }

    //if(q>56)while(1);

    answer(ENDS[0],ENDS[1]);
}

Compilation message

highway.cpp: In function 'void initbfs()':
highway.cpp:34:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   34 |         for(auto [v,edge]:G[u])
      |                  ^
highway.cpp: In function 'int onpath()':
highway.cpp:59:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   59 |             for(auto [v,edge]:G[u])
      |                      ^
highway.cpp:67:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   67 |             for(auto [v,edge]:G[u])
      |                      ^
highway.cpp: In function 'void nodesdfs(int)':
highway.cpp:91:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   91 |     for(auto [v,edge]:g[u])
      |              ^
highway.cpp: In function 'void solve(int, bool)':
highway.cpp:123:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  123 |     for(int i=0;i<g[root].size();i++)
      |                 ~^~~~~~~~~~~~~~~
highway.cpp: In function 'int onpath()':
highway.cpp:52:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |     int ans;
      |         ^~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4696 KB Output is correct
2 Correct 2 ms 4476 KB Output is correct
3 Correct 2 ms 4696 KB Output is correct
4 Correct 2 ms 4696 KB Output is correct
5 Correct 2 ms 4696 KB Output is correct
6 Correct 2 ms 4696 KB Output is correct
7 Correct 2 ms 4696 KB Output is correct
8 Correct 2 ms 4696 KB Output is correct
9 Correct 2 ms 4696 KB Output is correct
10 Correct 2 ms 4696 KB Output is correct
11 Correct 2 ms 4440 KB Output is correct
12 Correct 3 ms 4440 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4696 KB Output is correct
2 Correct 12 ms 5720 KB Output is correct
3 Correct 99 ms 14932 KB Output is correct
4 Correct 110 ms 15388 KB Output is correct
5 Correct 99 ms 14876 KB Output is correct
6 Correct 97 ms 15392 KB Output is correct
7 Correct 89 ms 14652 KB Output is correct
8 Correct 94 ms 14964 KB Output is correct
9 Correct 89 ms 14316 KB Output is correct
10 Correct 95 ms 14876 KB Output is correct
11 Correct 91 ms 14592 KB Output is correct
12 Correct 93 ms 15736 KB Output is correct
13 Correct 102 ms 15328 KB Output is correct
14 Correct 92 ms 14664 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 5976 KB Output is correct
2 Correct 17 ms 7512 KB Output is correct
3 Correct 25 ms 7560 KB Output is correct
4 Correct 81 ms 16924 KB Output is correct
5 Correct 70 ms 16644 KB Output is correct
6 Correct 73 ms 18312 KB Output is correct
7 Correct 70 ms 13580 KB Output is correct
8 Correct 72 ms 17548 KB Output is correct
9 Correct 87 ms 14684 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4696 KB Output is correct
2 Correct 11 ms 5720 KB Output is correct
3 Correct 74 ms 12144 KB Output is correct
4 Correct 91 ms 14224 KB Output is correct
5 Correct 103 ms 14196 KB Output is correct
6 Correct 104 ms 14464 KB Output is correct
7 Correct 86 ms 14312 KB Output is correct
8 Correct 88 ms 14160 KB Output is correct
9 Correct 103 ms 15504 KB Output is correct
10 Correct 97 ms 14976 KB Output is correct
11 Correct 91 ms 14340 KB Output is correct
12 Correct 100 ms 15528 KB Output is correct
13 Correct 86 ms 14636 KB Output is correct
14 Correct 94 ms 15372 KB Output is correct
15 Correct 87 ms 14288 KB Output is correct
16 Correct 93 ms 14208 KB Output is correct
17 Correct 95 ms 14812 KB Output is correct
18 Correct 95 ms 15456 KB Output is correct
19 Correct 90 ms 14380 KB Output is correct
20 Correct 93 ms 15348 KB Output is correct
21 Correct 103 ms 16388 KB Output is correct
22 Correct 112 ms 16576 KB Output is correct
23 Correct 88 ms 15604 KB Output is correct
24 Correct 102 ms 15680 KB Output is correct
25 Correct 97 ms 18400 KB Output is correct

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 6232 KB Output is correct
2 Correct 13 ms 5824 KB Output is correct
3 Correct 110 ms 15740 KB Output is correct
4 Correct 117 ms 15700 KB Output is correct
5 Correct 146 ms 17004 KB Output is correct
6 Correct 160 ms 16428 KB Output is correct
7 Correct 151 ms 16908 KB Output is correct
8 Correct 141 ms 16060 KB Output is correct
9 Correct 110 ms 11824 KB Output is correct
10 Correct 106 ms 12036 KB Output is correct
11 Correct 115 ms 13752 KB Output is correct
12 Correct 149 ms 14896 KB Output is correct
13 Correct 131 ms 15624 KB Output is correct
14 Correct 148 ms 16476 KB Output is correct
15 Correct 138 ms 15988 KB Output is correct
16 Correct 118 ms 13084 KB Output is correct
17 Correct 96 ms 16252 KB Output is correct
18 Correct 100 ms 16336 KB Output is correct
19 Correct 102 ms 16344 KB Output is correct
20 Incorrect 103 ms 16576 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 5720 KB Output is correct
2 Correct 14 ms 5976 KB Output is correct
3 Correct 103 ms 14980 KB Output is correct
4 Correct 113 ms 14924 KB Output is correct
5 Correct 133 ms 15704 KB Output is correct
6 Correct 135 ms 16244 KB Output is correct
7 Correct 118 ms 15756 KB Output is correct
8 Correct 104 ms 15112 KB Output is correct
9 Correct 111 ms 15312 KB Output is correct
10 Correct 138 ms 16204 KB Output is correct
11 Correct 143 ms 16460 KB Output is correct
12 Correct 138 ms 16164 KB Output is correct
13 Correct 114 ms 13000 KB Output is correct
14 Correct 108 ms 12024 KB Output is correct
15 Correct 106 ms 12956 KB Output is correct
16 Correct 110 ms 12100 KB Output is correct
17 Correct 114 ms 13532 KB Output is correct
18 Correct 110 ms 12352 KB Output is correct
19 Correct 152 ms 15040 KB Output is correct
20 Correct 134 ms 15388 KB Output is correct
21 Correct 151 ms 16040 KB Output is correct
22 Correct 154 ms 15976 KB Output is correct
23 Correct 156 ms 15952 KB Output is correct
24 Correct 150 ms 16008 KB Output is correct
25 Correct 153 ms 15932 KB Output is correct
26 Correct 145 ms 16288 KB Output is correct
27 Correct 93 ms 16424 KB Output is correct
28 Correct 102 ms 16328 KB Output is correct
29 Correct 102 ms 16548 KB Output is correct
30 Correct 103 ms 16432 KB Output is correct
31 Correct 93 ms 16340 KB Output is correct
32 Incorrect 95 ms 16312 KB Output isn't correct
33 Halted 0 ms 0 KB -