oj.uz

Submission #283233

# Submission time Handle Problem Language Result Execution time Memory
283233 2020-08-25T11:48:54 Z stoyan_malinin Highway Tolls (IOI18_highway) C++14
100 / 100
 316 ms 11924 KB 
#include "highway.h"
//#include "grader.cpp"

#include <set>
#include <queue>
#include <vector>
#include <assert.h>
#include <iostream>

using namespace std;

const int MAXN = 1e5 + 5;
const int MAXLog = 18;

int n;
vector <pair <int, int>> graph[MAXN];

long long base;
vector <int> edgeInd;

int getFirstEdge()
{
    vector <int> v;
    v.assign(edgeInd.size(), 0);

    int ind = 0;
    base = ask(v);

    int l = 0, r = edgeInd.size() - 1, mid;
    while(l!=r)
    {
        mid = (l+r)/2;
        for(int i = 0;i<edgeInd.size();i++)
        {
            if(edgeInd[i]<=mid) v[i] = 1;
            else v[i] = 0;
        }

        if(ask(v)!=base) r = mid;
        else l = mid + 1;
    }

    return l;
}

int getLastEdge(int addedEdges)
{
    vector <int> v;
    v.assign(edgeInd.size(), 0);

    int l = -1, r = addedEdges - 1, mid;
    while(l!=r)
    {
        mid = (l+r+1)/2;
        for(int i = 0;i<edgeInd.size();i++)
        {
            if(edgeInd[i]>=mid) v[i] = 1;
            else v[i] = 0;
        }

        if(ask(v)!=base) l = mid;
        else r = mid - 1;
    }

    return l;
}

vector <int> getDist(int x)
{
    queue <int> q;

    vector <int> dist;
    dist.assign(n, -1);

    q.push(x);
    dist[x] = 0;
    while(q.empty()==false)
    {
        x = q.front();
        q.pop();

        for(pair <int, int> item: graph[x])
        {
            if(dist[item.first]==-1)
            {
                dist[item.first] = dist[x] + 1;
                q.push(item.first);
            }
        }
    }

    return dist;
}

void find_pair(int N, vector<int> U, vector<int> V, int A, int B)
{
    //cout << '\n';

    n = N;
    for(int i = 0;i<U.size();i++)
    {
        graph[ U[i] ].push_back({V[i], i});
        graph[ V[i] ].push_back({U[i], i});
    }
    for(int i = 0;i<U.size();i++)
    {
        edgeInd.push_back(i);
    }

    int e = getFirstEdge();
    int nodes[] = {U[e], V[e]};
    //cout << nodes[0] << " " << nodes[1] << '\n';

    vector <int> dist[2];
    dist[0] = getDist(nodes[0]);
    dist[1] = getDist(nodes[1]);

    int ans[2];
    for(int rep = 0;rep<2;rep++)
    {
        //cout << " ----- " << rep << " ------ " << '\n';

        int addedEdges = 0;
        for(int i = 0;i<edgeInd.size();i++) edgeInd[i] = -1;

        queue <int> q;
        vector <int> d(n, -1);
        vector <int> vertexOfEdge(U.size(), -1);

        q.push(nodes[rep]);
        d[ nodes[rep] ] = 0;
        while(q.empty()==false)
        {
            int x = q.front();
            q.pop();

            //cout << x << " -> " << d[x] << '\n';
            for(pair <int, int> item: graph[x])
            {
                if(dist[rep][item.first]<dist[rep^1][item.first])
                {
                    if(d[item.first]==-1)
                    {
                        d[item.first] = d[x] + 1;
                        q.push(item.first);

                        edgeInd[item.second] = addedEdges;
                        vertexOfEdge[addedEdges] = item.first;

                        //cout << item.second << ": " << addedEdges << '\n';

                        addedEdges++;
                    }
                    else if(d[item.first]==d[x]+1)
                    {
                        edgeInd[item.second] = U.size() + 1;
                    }
                }
                else if(item.second!=e)
                {
                    edgeInd[item.second] = U.size() + 1;
                }
            }
        }

        int lastE = getLastEdge(addedEdges);

        //cout << lastE << '\n';
        ans[rep] = ((lastE==-1)?nodes[rep]:vertexOfEdge[lastE]);
    }

    //cout << ans[0] << " -- " << ans[1] << '\n';
    answer(ans[0], ans[1]);

}

/*
4 4
1 3
3 2

0 1
0 2
0 3
1 2
*/

Compilation message

highway.cpp: In function 'int getFirstEdge()':
highway.cpp:33:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         for(int i = 0;i<edgeInd.size();i++)
      |                       ~^~~~~~~~~~~~~~~
highway.cpp:26:9: warning: unused variable 'ind' [-Wunused-variable]
   26 |     int ind = 0;
      |         ^~~
highway.cpp: In function 'int getLastEdge(int)':
highway.cpp:55:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for(int i = 0;i<edgeInd.size();i++)
      |                       ~^~~~~~~~~~~~~~~
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:100:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  100 |     for(int i = 0;i<U.size();i++)
      |                   ~^~~~~~~~~
highway.cpp:105:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |     for(int i = 0;i<U.size();i++)
      |                   ~^~~~~~~~~
highway.cpp:124:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |         for(int i = 0;i<edgeInd.size();i++) edgeInd[i] = -1;
      |                       ~^~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2688 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct
7 Correct 2 ms 2688 KB Output is correct
8 Correct 2 ms 2688 KB Output is correct
9 Correct 2 ms 2688 KB Output is correct
10 Correct 2 ms 2688 KB Output is correct
11 Correct 2 ms 2688 KB Output is correct
12 Correct 2 ms 2688 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2688 KB Output is correct
2 Correct 16 ms 3456 KB Output is correct
3 Correct 156 ms 9684 KB Output is correct
4 Correct 158 ms 9680 KB Output is correct
5 Correct 171 ms 9756 KB Output is correct
6 Correct 138 ms 9672 KB Output is correct
7 Correct 206 ms 9684 KB Output is correct
8 Correct 206 ms 9684 KB Output is correct
9 Correct 197 ms 9688 KB Output is correct
10 Correct 161 ms 9772 KB Output is correct
11 Correct 176 ms 9236 KB Output is correct
12 Correct 165 ms 9092 KB Output is correct
13 Correct 167 ms 9220 KB Output is correct
14 Correct 183 ms 9152 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 3456 KB Output is correct
2 Correct 30 ms 4252 KB Output is correct
3 Correct 53 ms 4936 KB Output is correct
4 Correct 110 ms 9244 KB Output is correct
5 Correct 166 ms 9084 KB Output is correct
6 Correct 119 ms 9288 KB Output is correct
7 Correct 131 ms 9092 KB Output is correct
8 Correct 121 ms 9084 KB Output is correct
9 Correct 120 ms 9088 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2688 KB Output is correct
2 Correct 16 ms 3456 KB Output is correct
3 Correct 145 ms 8148 KB Output is correct
4 Correct 190 ms 9664 KB Output is correct
5 Correct 208 ms 9664 KB Output is correct
6 Correct 160 ms 9656 KB Output is correct
7 Correct 154 ms 9688 KB Output is correct
8 Correct 154 ms 9764 KB Output is correct
9 Correct 165 ms 9664 KB Output is correct
10 Correct 227 ms 9676 KB Output is correct
11 Correct 235 ms 9096 KB Output is correct
12 Correct 227 ms 9104 KB Output is correct
13 Correct 196 ms 9096 KB Output is correct
14 Correct 227 ms 9136 KB Output is correct
15 Correct 155 ms 9684 KB Output is correct
16 Correct 188 ms 9724 KB Output is correct
17 Correct 192 ms 9232 KB Output is correct
18 Correct 208 ms 9116 KB Output is correct
19 Correct 178 ms 9700 KB Output is correct
20 Correct 203 ms 9084 KB Output is correct
21 Correct 162 ms 10184 KB Output is correct
22 Correct 156 ms 10208 KB Output is correct
23 Correct 182 ms 9968 KB Output is correct
24 Correct 143 ms 9888 KB Output is correct
25 Correct 167 ms 9196 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 3448 KB Output is correct
2 Correct 20 ms 3604 KB Output is correct
3 Correct 176 ms 10168 KB Output is correct
4 Correct 214 ms 10632 KB Output is correct
5 Correct 290 ms 11768 KB Output is correct
6 Correct 310 ms 11756 KB Output is correct
7 Correct 261 ms 11732 KB Output is correct
8 Correct 249 ms 11748 KB Output is correct
9 Correct 169 ms 9656 KB Output is correct
10 Correct 191 ms 10112 KB Output is correct
11 Correct 188 ms 10396 KB Output is correct
12 Correct 221 ms 11416 KB Output is correct
13 Correct 305 ms 11724 KB Output is correct
14 Correct 295 ms 11792 KB Output is correct
15 Correct 311 ms 11732 KB Output is correct
16 Correct 214 ms 10700 KB Output is correct
17 Correct 190 ms 10204 KB Output is correct
18 Correct 143 ms 10416 KB Output is correct
19 Correct 137 ms 10300 KB Output is correct
20 Correct 186 ms 10348 KB Output is correct
21 Correct 302 ms 11868 KB Output is correct

Subtask #6
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 3448 KB Output is correct
2 Correct 20 ms 3620 KB Output is correct
3 Correct 247 ms 10132 KB Output is correct
4 Correct 201 ms 10700 KB Output is correct
5 Correct 265 ms 10756 KB Output is correct
6 Correct 233 ms 11764 KB Output is correct
7 Correct 180 ms 10152 KB Output is correct
8 Correct 191 ms 10408 KB Output is correct
9 Correct 216 ms 10720 KB Output is correct
10 Correct 316 ms 11828 KB Output is correct
11 Correct 239 ms 11728 KB Output is correct
12 Correct 238 ms 11924 KB Output is correct
13 Correct 177 ms 10444 KB Output is correct
14 Correct 177 ms 10104 KB Output is correct
15 Correct 237 ms 10468 KB Output is correct
16 Correct 166 ms 10324 KB Output is correct
17 Correct 243 ms 10476 KB Output is correct
18 Correct 179 ms 10288 KB Output is correct
19 Correct 304 ms 11396 KB Output is correct
20 Correct 306 ms 11524 KB Output is correct
21 Correct 316 ms 11832 KB Output is correct
22 Correct 298 ms 11872 KB Output is correct
23 Correct 261 ms 11804 KB Output is correct
24 Correct 263 ms 11736 KB Output is correct
25 Correct 312 ms 11824 KB Output is correct
26 Correct 310 ms 11740 KB Output is correct
27 Correct 170 ms 10340 KB Output is correct
28 Correct 152 ms 10272 KB Output is correct
29 Correct 129 ms 10624 KB Output is correct
30 Correct 175 ms 10376 KB Output is correct
31 Correct 134 ms 10368 KB Output is correct
32 Correct 132 ms 10332 KB Output is correct
33 Correct 148 ms 10616 KB Output is correct
34 Correct 149 ms 10292 KB Output is correct
35 Correct 140 ms 10356 KB Output is correct
36 Correct 149 ms 10208 KB Output is correct
37 Correct 150 ms 10648 KB Output is correct
38 Correct 153 ms 10388 KB Output is correct
39 Correct 229 ms 11772 KB Output is correct
40 Correct 281 ms 11872 KB Output is correct
41 Correct 225 ms 11836 KB Output is correct
42 Correct 253 ms 11852 KB Output is correct