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Submission #445884

# Submission time Handle Problem Language Result Execution time Memory
445884 2021-07-20T04:58:56 Z blue Flood (IOI07_flood) C++17
64 / 100
 595 ms 48416 KB 
#include <iostream>
#include <vector>
#include <deque>
#include <algorithm>
#include <bitset>
using namespace std;

const int maxN = 100'000;
const int maxW = 200'000;
vector<int> X(1+maxN), Y(1+maxN);
vector<int> A(1+maxW), B(1+maxW);

int N;
int W;

// vector<bool> T(1+maxN, 0), L(1+maxN, 0), D(1+maxN, 0), R(1+maxN, 0);
bitset<1+maxN> T;
bitset<1+maxN> L;
bitset<1+maxN> D;
bitset<1+maxN> R;

const int maxR = 4*maxN + 4;
vector< vector<int> > R_edge(1+maxR, vector<int>(0));
vector< vector<short> > R_wt(1+maxR, vector<short>(0));

void add_R_edge(int u, int v, int w)
{
    R_edge[u].push_back(v);
    R_wt[u].push_back(w);

    R_edge[v].push_back(u);
    R_wt[v].push_back(w);
}

/*
    0   1
      P
    2   3

    4*i + 0
    4*i + 1
    4*i + 2
    4*i + 3
*/

const int TL = 0;
const int TR = 1;
const int DL = 2;
const int DR = 3;

const int INF = 1e9;

int main()
{
    // bitset<maxN> H;
    // H.set(0, 1);
    // H.set(1, 1);
    // cout << H[0] + H[1] << '\n';

    cin >> N;
    for(int i = 1; i <= N; i++)
        cin >> X[i] >> Y[i];


    cin >> W;
    for(int j = 1; j <= W; j++)
    {
        cin >> A[j] >> B[j];

        if(X[ A[j] ] == X[ B[j] ])
        {
            if(Y[ A[j] ] > Y[ B[j] ])
                swap(A[j], B[j]);

            // D[ A[j] ] = 1;
            D.set(A[j], 1);
            // T[ B[j] ] = 1;
            T.set(B[j], 1);

            add_R_edge(4*A[j] + DL, 4*B[j] + TL, 0);
            add_R_edge(4*A[j] + DR, 4*B[j] + TR, 0);
        }
        else //if(Y[ A[j] ] == Y[ B[j] ])
        {
            if(X[ A[j] ] > X[ B[j] ])
                swap(A[j], B[j]);

            // R[ A[j] ] = 1;
            // L[ B[j] ] = 1;
            R.set(A[j], 1);
            L.set(B[j], 1);

            add_R_edge(4*A[j] + TR, 4*B[j] + TL, 0);
            add_R_edge(4*A[j] + DR, 4*B[j] + DL, 0);
        }
    }







    for(int i = 1; i <= N; i++)
    {
        add_R_edge(4*i + TL, 4*i + TR, T[i]);
        add_R_edge(4*i + TL, 4*i + DL, L[i]);
        add_R_edge(4*i + TR, 4*i + DR, R[i]);
        add_R_edge(4*i + DL, 4*i + DR, D[i]);
    }

    // cerr << "check\n";





    vector<unsigned short> outside_dist(1+maxR, 65000);
    deque<int> tbv;

    vector<int> O(N);
    for(int i = 0; i < N; i++) O[i] = i+1;

    sort(O.begin(), O.end(), [] (int a1, int a2)
    {
        return X[a1] < X[a2];
    });


    for(int U: O)
    {
        // cerr << "U = " << U << '\n';
        if(outside_dist[4*U + TL] != 65000) continue;
        outside_dist[4*U + TL] = 0;

        tbv.push_front(4*U + TL);

        while(!tbv.empty())
        {
            int u = tbv.front();
            tbv.pop_front();

            for(int e = 0; e < R_edge[u].size(); e++)
            {
                int v = R_edge[u][e];
                int w = R_wt[u][e];

                if(outside_dist[v] <= outside_dist[u] + w) continue;

                outside_dist[v] = outside_dist[u] + w;

                if(w == 0) tbv.push_front(v);
                else tbv.push_back(v);
            }
        }
    }

    // cerr << "check\n";


    vector<int> res;

    for(int j = 1; j <= W; j++)
    {
        if(X[ A[j] ] == X[ B[j] ])
        {
            if(outside_dist[4*A[j] + DL] == outside_dist[4*A[j] + DR])
            {
                res.push_back(j);
            }
        }
        else //if(Y[ A[j] ] == Y[ B[j] ])
        {
            if(outside_dist[4*A[j] + TR] == outside_dist[4*A[j] + DR])
            {
                res.push_back(j);
            }
        }
    }

    cout << res.size() << '\n';
    for(int r:res) cout << r << '\n';
}

Compilation message

flood.cpp: In function 'int main()':
flood.cpp:143:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  143 |             for(int e = 0; e < R_edge[u].size(); e++)
      |                            ~~^~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 22220 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 22168 KB Output is correct
2 Correct 14 ms 22220 KB Output is correct
3 Correct 14 ms 22220 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 22172 KB Output is correct

Subtask #4
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 22220 KB Output is correct
2 Correct 19 ms 22352 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 22224 KB Output is correct
2 Correct 14 ms 22220 KB Output is correct

Subtask #6
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 22272 KB Output is correct

Subtask #7
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 22316 KB Output is correct

Subtask #8
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 22256 KB Output is correct
2 Correct 16 ms 22352 KB Output is correct

Subtask #9
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 22264 KB Output is correct
2 Correct 15 ms 22216 KB Output is correct

Subtask #10
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 80 ms 28744 KB Output is correct

Subtask #11
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 243 ms 44168 KB Memory limit exceeded

Subtask #12
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 251 ms 45300 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 568 ms 48152 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 595 ms 48416 KB Memory limit exceeded
2 Halted 0 ms 0 KB -