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Submission #1100502

# Submission time Handle Problem Language Result Execution time Memory
1100502 2024-10-14T06:30:24 Z MMihalev Simurgh (IOI17_simurgh) C++14
51 / 100
 95 ms 4280 KB 
#include<iostream>
#include<algorithm>
#include<set>
#include<queue>
#include "simurgh.h"
using namespace std;
const int MAX_N=5e2+3;
const int MAX_M=125000;
int n,m;
int q;
vector<int>edges;
vector<pair<int,int>>g[MAX_N];
bool used[MAX_N];
vector<int>comp;
vector<vector<int>>comps;
int adj[MAX_N];
int numedge[MAX_N][MAX_N];

bool stat[MAX_M];
bool checked[MAX_M];
int forsure;

void reset()
{
    comps.clear();
    edges.clear();
    for(int i=0;i<n;i++)
    {
        adj[i]=-1;
        used[i]=0;
    }
}
void dfs(int u)
{
    if(adj[u]!=-1)
    {
        if(!checked[adj[u]])
        {
            comp.push_back(adj[u]);
        }
        if(stat[adj[u]])forsure=adj[u];
    }
    used[u]=1;
    for(auto [v,edge]:g[u])
    {
        if(used[v])continue;
        edges.push_back(edge);
        dfs(v);
    }
}
void rep(int prev,int edge)
{
    for(int i=0;i<edges.size();i++)
    {
        if(edges[i]==prev){edges[i]=edge;return;}
    }
}
vector<pair<int,int>>s;
int rec(int l,int r)
{
    if(l==r)
    {
        return s[l].first;
    }

    int mid=(l+r)/2;

    int bonus=0;
    edges.clear();
    for(int i=0;i<n;i++)used[i]=0;

    for(int i=l;i<=mid;i++)
    {
        edges.push_back(s[i].first);
        used[s[i].second]=1;
    }

    for(int i=1;i<n;i++)
    {
        if(!used[i]){bonus+=stat[numedge[0][i]];edges.push_back(numedge[0][i]);}
    }

    int cnt=count_common_roads(edges)-bonus;

    if(cnt>0)return rec(l,mid);
    return rec(mid+1,r);
}
vector<int> find_roads(int N, vector<int> u, vector<int> v)
{
    n=N;
    m=u.size();

    vector<int>ans;
    for(int i=0;i<m;i++)
    {
        g[u[i]].push_back({v[i],i});
        g[v[i]].push_back({u[i],i});
        numedge[u[i]][v[i]]=i;
        numedge[v[i]][u[i]]=i;
    }

    if(n<=240)
    {
        for(int u=0;u<n;u++)
        {
            reset();
            used[u]=1;
            for(auto [v,edge]:g[u])
            {
                adj[v]=edge;
            }
            for(auto [v,edge]:g[u])
            {
                if(!used[v])
                {
                    forsure=-1;
                    comp.clear();
                    dfs(v);
                    if(forsure!=-1)
                    {
                        comp.push_back(forsure);
                    }
                    comps.push_back(comp);
                }
            }

            for(auto c:comps)
            {
                edges.push_back(c[0]);
            }

            for(auto c:comps)
            {
                int ma=count_common_roads(edges);q++;
                vector<int>marked;
                marked.push_back(c[0]);
                int prev=c[0];
                int sega=0;

                for(int edge:c)
                {
                    if(edge==c[0])continue;

                    rep(prev,edge);

                    int cur=count_common_roads(edges);q++;
                    if(cur>ma)
                    {
                        sega++;
                        marked.clear();
                        ma=cur;
                        marked.push_back(edge);
                        if(sega==2)break;
                    }
                    else if(cur==ma)
                    {
                        marked.push_back(edge);
                    }

                    prev=edge;
                }

                for(int edge:marked)stat[edge]=1;
            }

            for(auto [v,edge]:g[u])checked[edge]=1;
        }

    }
    else
    {
        for(int u=0;u<n;u++)
        {
            if(u==0)
            {
                vector<int>marked;
                edges.clear();
                for(int v=2;v<n;v++)
                {
                    edges.push_back(numedge[v-1][v]);
                }

                int ma=-1;

                for(auto [v,edge]:g[u])
                {
                    edges.push_back(edge);
                    int cur=count_common_roads(edges);

                    if(cur>ma)
                    {
                        marked.clear();
                        marked.push_back(edge);
                        ma=cur;
                    }
                    else if(cur==ma)marked.push_back(edge);
                }

                for(int edge:marked)stat[edge]=1;

                continue;
            }


            while(1)
            {
                int bonus=0;
                edges.clear();
                s.clear();
                for(int i=0;i<n;i++)used[i]=0;

                for(auto [v,edge]:g[u])
                {
                    if(stat[edge] or v==0)continue;
                    edges.push_back(edge);
                    s.push_back({edge,v});
                    used[v]=1;
                }

                for(int i=1;i<n;i++)
                {
                    if(!used[i]){bonus+=stat[numedge[0][i]];edges.push_back(numedge[0][i]);}
                }

                int cur=count_common_roads(edges)-bonus;

                if(cur==0)break;

                int edge=rec(0,s.size()-1);
                stat[edge]=1;
            }
        }
    }

    for(int i=0;i<m;i++)
    {
        if(stat[i])ans.push_back(i);
    }

    if(ans.size()!=n-1)while(1);

    return ans;
}

Compilation message

simurgh.cpp: In function 'void dfs(int)':
simurgh.cpp:44:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   44 |     for(auto [v,edge]:g[u])
      |              ^
simurgh.cpp: In function 'void rep(int, int)':
simurgh.cpp:53:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     for(int i=0;i<edges.size();i++)
      |                 ~^~~~~~~~~~~~~
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:108:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  108 |             for(auto [v,edge]:g[u])
      |                      ^
simurgh.cpp:112:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  112 |             for(auto [v,edge]:g[u])
      |                      ^
simurgh.cpp:166:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  166 |             for(auto [v,edge]:g[u])checked[edge]=1;
      |                      ^
simurgh.cpp:185:26: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  185 |                 for(auto [v,edge]:g[u])
      |                          ^
simurgh.cpp:212:26: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  212 |                 for(auto [v,edge]:g[u])
      |                          ^
simurgh.cpp:240:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  240 |     if(ans.size()!=n-1)while(1);
      |        ~~~~~~~~~~^~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 336 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 336 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct
14 Correct 2 ms 592 KB correct
15 Correct 2 ms 592 KB correct
16 Correct 2 ms 592 KB correct
17 Correct 2 ms 592 KB correct
18 Correct 1 ms 336 KB correct
19 Correct 1 ms 592 KB correct
20 Correct 1 ms 592 KB correct
21 Correct 2 ms 592 KB correct
22 Correct 1 ms 592 KB correct
23 Correct 1 ms 592 KB correct
24 Correct 1 ms 760 KB correct
25 Correct 1 ms 336 KB correct
26 Correct 1 ms 592 KB correct
27 Correct 2 ms 592 KB correct
28 Correct 1 ms 336 KB correct
29 Correct 1 ms 336 KB correct
30 Correct 2 ms 592 KB correct
31 Correct 1 ms 592 KB correct
32 Correct 1 ms 592 KB correct
33 Correct 1 ms 592 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 336 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct
14 Correct 2 ms 592 KB correct
15 Correct 2 ms 592 KB correct
16 Correct 2 ms 592 KB correct
17 Correct 2 ms 592 KB correct
18 Correct 1 ms 336 KB correct
19 Correct 1 ms 592 KB correct
20 Correct 1 ms 592 KB correct
21 Correct 2 ms 592 KB correct
22 Correct 1 ms 592 KB correct
23 Correct 1 ms 592 KB correct
24 Correct 1 ms 760 KB correct
25 Correct 1 ms 336 KB correct
26 Correct 1 ms 592 KB correct
27 Correct 2 ms 592 KB correct
28 Correct 1 ms 336 KB correct
29 Correct 1 ms 336 KB correct
30 Correct 2 ms 592 KB correct
31 Correct 1 ms 592 KB correct
32 Correct 1 ms 592 KB correct
33 Correct 1 ms 592 KB correct
34 Correct 95 ms 1872 KB correct
35 Correct 90 ms 2040 KB correct
36 Correct 64 ms 1628 KB correct
37 Correct 6 ms 860 KB correct
38 Correct 89 ms 2036 KB correct
39 Correct 77 ms 1884 KB correct
40 Correct 68 ms 1616 KB correct
41 Correct 91 ms 2040 KB correct
42 Correct 88 ms 1872 KB correct
43 Correct 50 ms 1616 KB correct
44 Correct 40 ms 1368 KB correct
45 Correct 47 ms 1528 KB correct
46 Correct 36 ms 1360 KB correct
47 Correct 17 ms 1104 KB correct
48 Correct 3 ms 848 KB correct
49 Correct 6 ms 848 KB correct
50 Correct 17 ms 1104 KB correct
51 Correct 48 ms 1360 KB correct
52 Correct 40 ms 1360 KB correct
53 Correct 38 ms 1360 KB correct
54 Correct 50 ms 1784 KB correct
55 Correct 46 ms 1360 KB correct
56 Correct 51 ms 1360 KB correct
57 Correct 46 ms 1360 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Incorrect 12 ms 4280 KB WA in grader: NO
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB correct
2 Correct 1 ms 336 KB correct
3 Correct 1 ms 336 KB correct
4 Correct 1 ms 336 KB correct
5 Correct 1 ms 336 KB correct
6 Correct 1 ms 336 KB correct
7 Correct 1 ms 336 KB correct
8 Correct 1 ms 336 KB correct
9 Correct 1 ms 336 KB correct
10 Correct 1 ms 336 KB correct
11 Correct 1 ms 336 KB correct
12 Correct 1 ms 336 KB correct
13 Correct 1 ms 336 KB correct
14 Correct 2 ms 592 KB correct
15 Correct 2 ms 592 KB correct
16 Correct 2 ms 592 KB correct
17 Correct 2 ms 592 KB correct
18 Correct 1 ms 336 KB correct
19 Correct 1 ms 592 KB correct
20 Correct 1 ms 592 KB correct
21 Correct 2 ms 592 KB correct
22 Correct 1 ms 592 KB correct
23 Correct 1 ms 592 KB correct
24 Correct 1 ms 760 KB correct
25 Correct 1 ms 336 KB correct
26 Correct 1 ms 592 KB correct
27 Correct 2 ms 592 KB correct
28 Correct 1 ms 336 KB correct
29 Correct 1 ms 336 KB correct
30 Correct 2 ms 592 KB correct
31 Correct 1 ms 592 KB correct
32 Correct 1 ms 592 KB correct
33 Correct 1 ms 592 KB correct
34 Correct 95 ms 1872 KB correct
35 Correct 90 ms 2040 KB correct
36 Correct 64 ms 1628 KB correct
37 Correct 6 ms 860 KB correct
38 Correct 89 ms 2036 KB correct
39 Correct 77 ms 1884 KB correct
40 Correct 68 ms 1616 KB correct
41 Correct 91 ms 2040 KB correct
42 Correct 88 ms 1872 KB correct
43 Correct 50 ms 1616 KB correct
44 Correct 40 ms 1368 KB correct
45 Correct 47 ms 1528 KB correct
46 Correct 36 ms 1360 KB correct
47 Correct 17 ms 1104 KB correct
48 Correct 3 ms 848 KB correct
49 Correct 6 ms 848 KB correct
50 Correct 17 ms 1104 KB correct
51 Correct 48 ms 1360 KB correct
52 Correct 40 ms 1360 KB correct
53 Correct 38 ms 1360 KB correct
54 Correct 50 ms 1784 KB correct
55 Correct 46 ms 1360 KB correct
56 Correct 51 ms 1360 KB correct
57 Correct 46 ms 1360 KB correct
58 Correct 1 ms 336 KB correct
59 Correct 1 ms 336 KB correct
60 Incorrect 12 ms 4280 KB WA in grader: NO
61 Halted 0 ms 0 KB -