oj.uz

Submission #286457

# Submission time Handle Problem Language Result Execution time Memory
286457 2020-08-30T12:26:09 Z stoyan_malinin Simurgh (IOI17_simurgh) C++14
51 / 100
 249 ms 5488 KB 
#include "simurgh.h"
//#include "grader.cpp"

#include <set>
#include <random>
#include <vector>
#include <assert.h>
#include <iostream>
#include <algorithm>

using namespace std;

const int MAXN = 250;
mt19937 rnd(22);

int ASKED = 0;

struct DSU
{
    int parent[MAXN*MAXN];
    int color[MAXN*MAXN];

    DSU(){}
    DSU(int n)
    {
        for(int i = 0;i<=n;i++)
        {
            this->parent[i] = i;
            this->color[i] = -1;
        }
    }

    void reset(int n)
    {
        for(int i = 0;i<=n;i++)
        {
            this->parent[i] = i;
            this->color[i] = -1;
        }
    }

    int Find(int x)
    {
        if(parent[x]==x) return x;

        parent[x] = Find(parent[x]);
        return parent[x];
    }

    bool UnionSimple(int u, int v)
    {
        u = Find(u);
        v = Find(v);
        if(u==v) return false;

        parent[v] = u;
        return true;
    }

    bool UnionFull(int u, int v)
    {
        u = Find(u);
        v = Find(v);
        if(u==v) return false;

        int newColor = max(color[u], color[v]);
        color[u] = newColor;
        color[v] = newColor;

        parent[v] = u;
        return true;
    }

    int getColor(int x)
    {
        return color[Find(x)];
    }

    void colorize(int x, int col)
    {
        x = Find(x);
        color[x] = col;
    }
};

DSU relationKeeper;

int n;
vector <pair <int, int>> edges;

DSU T;
vector <int> inds;

vector <int> constructST()
{
    T.reset(n);
    vector <int> ST;

    for(int i: inds)
    {
        if(relationKeeper.getColor(i)==1)
        {
            T.UnionSimple(edges[i].first, edges[i].second);
            ST.push_back(i);
        }
    }

    for(int i: inds)
    {
        if(relationKeeper.getColor(i)!=0 && T.UnionSimple(edges[i].first, edges[i].second)==true)
        {
            ST.push_back(i);
        }
    }

    return ST;
}

int askVector(vector <int> v)
{
    ASKED++;
    if(ASKED==30*1000) assert(false);

    return count_common_roads(v);
}

int askSet(set <int> s)
{
    ASKED++;
    if(ASKED==30*1000) assert(false);

    vector <int> v;
    for(int x: s) v.push_back(x);

    return count_common_roads(v);
}

vector <int> getReplacements(vector <int> &ST, int e)
{
    T.reset(n);

    for(int edgeInd: ST)
        if(edgeInd!=e) T.UnionSimple(edges[edgeInd].first, edges[edgeInd].second);

    vector <int> out;
    for(int i = 0;i<edges.size();i++)
    {
        if(i==e) continue;
        if(T.Find(edges[i].first)==T.Find(edges[i].second)) continue;

        out.push_back(i);
        //if(relationKeeper.getColor(i)!=-1) break;
    }

    return out;
}

int getDiff(vector <int> &ST, int e1, int e2, int base)
{
    ST.push_back(e2);
    int res = askVector(ST);
    ST.pop_back();

    if(base==res) return 0;
    if(base<res) return 1;
    if(base>res) return 2;
}

void processDif(int e1, int e2, int diff)
{
    if(diff==0)
    {
        relationKeeper.UnionFull(e1, e2);
    }
    else if(diff==1)
    {
        relationKeeper.colorize(e1, 0);
        relationKeeper.colorize(e2, 1);
    }
    else if(diff==2)
    {
        relationKeeper.colorize(e1, 1);
        relationKeeper.colorize(e2, 0);
    }
}

vector <int> set2Vector(set <int> s)
{
    vector <int> out;
    for(int x: s) out.push_back(x);

    return out;
}

vector<int> find_roads(int N, vector<int> U, vector<int> V)
{
    n = N;
    for(int i = 0;i<U.size();i++) edges.push_back({U[i], V[i]});
    relationKeeper = DSU(edges.size());

    for(int i = 0;i<edges.size();i++)
        inds.push_back(i);

    for(int iter = 0;iter<=n*n/2;iter++)
    {
        shuffle(inds.begin(), inds.end(), rnd);
        vector <int> ST = constructST();

        //cout << "currST: ";
        //for(int x: ST) cout << " " << x;
        //cout << '\n';

        int royalCnt = askVector(ST);
        if(royalCnt==n-1) return ST;

        int e = -1;
        for(int i = 0;i<ST.size();i++)
        {
            if(relationKeeper.getColor(ST[i])==-1)
            {
                e = ST[i];
                ST.erase(ST.begin()+i);

                break;
            }
        }
        //if(e==-1) return {};

        //cout << " --- " << e << " --- " << '\n';

        vector <int> replacements = getReplacements(ST, e);

        //cout << "replacements:";
        //for(int x: replacements) cout << " " << x;
        //cout << '\n';

        /*
        for(int edgeInd: replacements)
        {
            if(relationKeeper.getColor(edgeInd)!=-1)
            {
                int diff = getDiff(ST, e, edgeInd, royalCnt);
                processDif(e, edgeInd, diff);

                break;
            }
        }
        */

        if(relationKeeper.getColor(e)==-1)
        {
            for(int edgeInd: replacements)
            {
                //if(edgeInd==e) return {};
                //if(!(edgeInd>=0 && edgeInd<edges.size())) return {};
                if(relationKeeper.getColor(e)!=-1 && relationKeeper.getColor(edgeInd)!=-1) continue;

                int diff = getDiff(ST, e, edgeInd, royalCnt);
                processDif(e, edgeInd, diff);
            }

            if(relationKeeper.getColor(e)==-1)
            {
                relationKeeper.colorize(e, 1);
                for(int edgeInd: replacements)
                    relationKeeper.colorize(edgeInd, 1);
            }
        }

        //cout << "color of " << e << " is " << relationKeeper.getColor(e) << '\n';
    }

    return {};
}
/*
4 6
0 1
0 2
0 3
1 2
1 3
2 3
0 1 5
*/

Compilation message

simurgh.cpp: In function 'std::vector<int> getReplacements(std::vector<int>&, int)':
simurgh.cpp:146:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  146 |     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:198:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  198 |     for(int i = 0;i<U.size();i++) edges.push_back({U[i], V[i]});
      |                   ~^~~~~~~~~
simurgh.cpp:201:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  201 |     for(int i = 0;i<edges.size();i++)
      |                   ~^~~~~~~~~~~~~
simurgh.cpp:217:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  217 |         for(int i = 0;i<ST.size();i++)
      |                       ~^~~~~~~~~~
simurgh.cpp: In function 'int getDiff(std::vector<int>&, int, int, int)':
simurgh.cpp:167:1: warning: control reaches end of non-void function [-Wreturn-type]
  167 | }
      | ^

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB correct
2 Correct 1 ms 768 KB correct
3 Correct 1 ms 768 KB correct
4 Correct 1 ms 768 KB correct
5 Correct 1 ms 768 KB correct
6 Correct 1 ms 768 KB correct
7 Correct 1 ms 768 KB correct
8 Correct 1 ms 768 KB correct
9 Correct 1 ms 768 KB correct
10 Correct 1 ms 768 KB correct
11 Correct 1 ms 768 KB correct
12 Correct 1 ms 768 KB correct
13 Correct 1 ms 768 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB correct
2 Correct 1 ms 768 KB correct
3 Correct 1 ms 768 KB correct
4 Correct 1 ms 768 KB correct
5 Correct 1 ms 768 KB correct
6 Correct 1 ms 768 KB correct
7 Correct 1 ms 768 KB correct
8 Correct 1 ms 768 KB correct
9 Correct 1 ms 768 KB correct
10 Correct 1 ms 768 KB correct
11 Correct 1 ms 768 KB correct
12 Correct 1 ms 768 KB correct
13 Correct 1 ms 768 KB correct
14 Correct 3 ms 896 KB correct
15 Correct 4 ms 896 KB correct
16 Correct 3 ms 896 KB correct
17 Correct 3 ms 896 KB correct
18 Correct 2 ms 896 KB correct
19 Correct 3 ms 896 KB correct
20 Correct 3 ms 896 KB correct
21 Correct 3 ms 896 KB correct
22 Correct 3 ms 896 KB correct
23 Correct 3 ms 896 KB correct
24 Correct 3 ms 896 KB correct
25 Correct 2 ms 768 KB correct
26 Correct 2 ms 896 KB correct
27 Correct 2 ms 896 KB correct
28 Correct 2 ms 896 KB correct
29 Correct 2 ms 768 KB correct
30 Correct 2 ms 896 KB correct
31 Correct 2 ms 896 KB correct
32 Correct 3 ms 896 KB correct
33 Correct 2 ms 896 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB correct
2 Correct 1 ms 768 KB correct
3 Correct 1 ms 768 KB correct
4 Correct 1 ms 768 KB correct
5 Correct 1 ms 768 KB correct
6 Correct 1 ms 768 KB correct
7 Correct 1 ms 768 KB correct
8 Correct 1 ms 768 KB correct
9 Correct 1 ms 768 KB correct
10 Correct 1 ms 768 KB correct
11 Correct 1 ms 768 KB correct
12 Correct 1 ms 768 KB correct
13 Correct 1 ms 768 KB correct
14 Correct 3 ms 896 KB correct
15 Correct 4 ms 896 KB correct
16 Correct 3 ms 896 KB correct
17 Correct 3 ms 896 KB correct
18 Correct 2 ms 896 KB correct
19 Correct 3 ms 896 KB correct
20 Correct 3 ms 896 KB correct
21 Correct 3 ms 896 KB correct
22 Correct 3 ms 896 KB correct
23 Correct 3 ms 896 KB correct
24 Correct 3 ms 896 KB correct
25 Correct 2 ms 768 KB correct
26 Correct 2 ms 896 KB correct
27 Correct 2 ms 896 KB correct
28 Correct 2 ms 896 KB correct
29 Correct 2 ms 768 KB correct
30 Correct 2 ms 896 KB correct
31 Correct 2 ms 896 KB correct
32 Correct 3 ms 896 KB correct
33 Correct 2 ms 896 KB correct
34 Correct 243 ms 2092 KB correct
35 Correct 233 ms 2172 KB correct
36 Correct 165 ms 1788 KB correct
37 Correct 13 ms 896 KB correct
38 Correct 230 ms 2296 KB correct
39 Correct 249 ms 2044 KB correct
40 Correct 158 ms 1788 KB correct
41 Correct 181 ms 2292 KB correct
42 Correct 150 ms 2172 KB correct
43 Correct 114 ms 1536 KB correct
44 Correct 97 ms 1408 KB correct
45 Correct 112 ms 1536 KB correct
46 Correct 88 ms 1408 KB correct
47 Correct 44 ms 1024 KB correct
48 Correct 11 ms 896 KB correct
49 Correct 17 ms 896 KB correct
50 Correct 42 ms 1024 KB correct
51 Correct 111 ms 1536 KB correct
52 Correct 95 ms 1408 KB correct
53 Correct 90 ms 1408 KB correct
54 Correct 114 ms 1536 KB correct
55 Correct 97 ms 1536 KB correct
56 Correct 113 ms 1536 KB correct
57 Correct 113 ms 1584 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB correct
2 Correct 1 ms 768 KB correct
3 Runtime error 23 ms 5488 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB correct
2 Correct 1 ms 768 KB correct
3 Correct 1 ms 768 KB correct
4 Correct 1 ms 768 KB correct
5 Correct 1 ms 768 KB correct
6 Correct 1 ms 768 KB correct
7 Correct 1 ms 768 KB correct
8 Correct 1 ms 768 KB correct
9 Correct 1 ms 768 KB correct
10 Correct 1 ms 768 KB correct
11 Correct 1 ms 768 KB correct
12 Correct 1 ms 768 KB correct
13 Correct 1 ms 768 KB correct
14 Correct 3 ms 896 KB correct
15 Correct 4 ms 896 KB correct
16 Correct 3 ms 896 KB correct
17 Correct 3 ms 896 KB correct
18 Correct 2 ms 896 KB correct
19 Correct 3 ms 896 KB correct
20 Correct 3 ms 896 KB correct
21 Correct 3 ms 896 KB correct
22 Correct 3 ms 896 KB correct
23 Correct 3 ms 896 KB correct
24 Correct 3 ms 896 KB correct
25 Correct 2 ms 768 KB correct
26 Correct 2 ms 896 KB correct
27 Correct 2 ms 896 KB correct
28 Correct 2 ms 896 KB correct
29 Correct 2 ms 768 KB correct
30 Correct 2 ms 896 KB correct
31 Correct 2 ms 896 KB correct
32 Correct 3 ms 896 KB correct
33 Correct 2 ms 896 KB correct
34 Correct 243 ms 2092 KB correct
35 Correct 233 ms 2172 KB correct
36 Correct 165 ms 1788 KB correct
37 Correct 13 ms 896 KB correct
38 Correct 230 ms 2296 KB correct
39 Correct 249 ms 2044 KB correct
40 Correct 158 ms 1788 KB correct
41 Correct 181 ms 2292 KB correct
42 Correct 150 ms 2172 KB correct
43 Correct 114 ms 1536 KB correct
44 Correct 97 ms 1408 KB correct
45 Correct 112 ms 1536 KB correct
46 Correct 88 ms 1408 KB correct
47 Correct 44 ms 1024 KB correct
48 Correct 11 ms 896 KB correct
49 Correct 17 ms 896 KB correct
50 Correct 42 ms 1024 KB correct
51 Correct 111 ms 1536 KB correct
52 Correct 95 ms 1408 KB correct
53 Correct 90 ms 1408 KB correct
54 Correct 114 ms 1536 KB correct
55 Correct 97 ms 1536 KB correct
56 Correct 113 ms 1536 KB correct
57 Correct 113 ms 1584 KB correct
58 Correct 1 ms 768 KB correct
59 Correct 1 ms 768 KB correct
60 Runtime error 23 ms 5488 KB Execution killed with signal 11
61 Halted 0 ms 0 KB -