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Submission #607566

# Submission time Handle Problem Language Result Execution time Memory
607566 2022-07-26T20:15:30 Z yanndev Toy Train (IOI17_train) C++17
0 / 100
 9 ms 1004 KB 
#include <bits/stdc++.h>
using namespace std;

const int MX = 5042;

int n;
int deg[MX];
bool vis[MX];
bool vis2[MX];
bool isOk[MX];
bool isAlice[MX];
bool isCharge[MX];
vector<int> rgraph[MX];

bool BFS() {
    queue<int> nxt {};
    for (int i = 0; i < n; i++)
        deg[i] = 0;
    for (int i = 0; i < n; i++) {
        for (auto& x: rgraph[i])
            deg[x]++;
        if (isCharge[i] && isOk[i])
            nxt.push(i);
        vis[i] = vis2[i] = false;
    }

    //cout << layer << ' ' << (int)nxt.size() << '\n';
    
    while (!nxt.empty()) {
        auto cur = nxt.front();
        //cout << "cur is " << cur << '\n';
        nxt.pop();

        if (vis[cur])
            continue;
        vis[cur] = true;

        for (auto& x: rgraph[cur]) {
            if (!vis2[x] && ((--deg[x] == 0) || isAlice[x])) {
                vis2[x] = true;
                nxt.push(x);
            }
        }
    }

    for (int i = 0; i < n; i++) {
        if (isOk[i] && !vis2[i]) {
            isOk[i] = false;
            return false;
        }
    }
}

vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v) {
    n = (int)a.size();

    for (int i = 0; i < (int)u.size(); i++)
        rgraph[v[i]].push_back(u[i]);
    
    for (int i = 0; i < n; i++) {
        isAlice[i] = a[i];
        isCharge[i] = r[i];
        isOk[i] = true;
    }

    while (BFS());

    vector<int> ans (n);
    for (int i = 0; i < n; i++)
        ans[i] = isOk[i];
    return ans;
}

/*int main() {
    for (auto& x: who_wins({0, 1}, {1, 0}, {0, 0, 1, 1}, {0, 1, 0, 1}))
        cout << x << ' ';
}*/

Compilation message

train.cpp: In function 'bool BFS()':
train.cpp:16:21: warning: control reaches end of non-void function [-Wreturn-type]
   16 |     queue<int> nxt {};
      |                     ^

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 724 KB 3rd lines differ - on the 1st token, expected: '0', found: '1'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 340 KB 3rd lines differ - on the 6th token, expected: '0', found: '1'
2 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 9 ms 1004 KB 3rd lines differ - on the 1st token, expected: '0', found: '1'
2 Halted 0 ms 0 KB -

Subtask #4
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 980 KB 3rd lines differ - on the 696th token, expected: '0', found: '1'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 1004 KB 3rd lines differ - on the 6th token, expected: '0', found: '1'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 51.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 724 KB 3rd lines differ - on the 1st token, expected: '0', found: '1'
2 Halted 0 ms 0 KB -