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Submission #699737

# Submission time Handle Problem Language Result Execution time Memory
699737 2023-02-17T21:37:35 Z Lobo Parking (CEOI22_parking) C++17
12 / 100
 106 ms 38760 KB 
#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
const int maxn = 4e5+10/1000;

int n, m, b[maxn], t[maxn], in[maxn], done[maxn], out[maxn];
vector<int> pos[maxn], ot[3], g[maxn];

void solve() {
    cin >> n >> m;
    vector<int> ept;
    int cntdone = 0;
    for(int i = 1; i <= m; i++) {
        cin >> b[i] >> t[i];
        
        if(b[i] == 0) {
            ept.pb(i);
            continue;
        }

        if(b[i] != 0) pos[b[i]].pb(i);
        if(t[i] != 0) pos[t[i]].pb(i+m);

        if(b[i] == t[i]) {
            done[b[i]] = 1; cntdone++;
        }
        else if(b[i] != 0 && t[i] != 0) {
            g[t[i]].pb(b[i]);
            out[t[i]]++;
            in[b[i]]++;
        }
    }

    for(int i = 1; i <= n; i++) {
        if(done[i] == 0 && in[i] == 0) {
            ot[out[i]].pb(i);
        }
    }

    vector<pair<int,int>> ans;
    while(true) {
        if(ot[0].size()) {
            int i = ot[0].back(); ot[0].pop_back(); 
            if(done[i]) continue;
            done[i] = 1; 
            cntdone++;
            sort(all(pos[i]));
            int p1 = pos[i][0];
            int p2 = pos[i][1];
            ans.pb(mp(p1,p2));
            b[p1] = 0;
            t[p2] = i;
            ept.pb(p1);
            pos[i][0] = p2+m;
        }
        else if(ot[1].size()) {
            int i = ot[1].back(); ot[1].pop_back(); 
            if(done[i]) continue;
            done[i] = 1; 
            cntdone++;
            sort(all(pos[i]));
            int p1 = pos[i][0];
            int p2 = pos[i][1];
            ans.pb(mp(p2,p1));
            t[p2-m] = 0;
            for(auto x : g[i]) {
                if(--in[x] == 0) {
                    ot[out[x]].pb(x);
                }
            }
            t[p1] = i;
            pos[i][1] = p1+m;
        }
        else if(ot[2].size() && ept.size()) {
            int i = ot[2].back(); ot[2].pop_back(); 
            if(done[i]) continue;
            done[i] = 1; 
            cntdone++;
            int e = ept.back(); ept.pop_back();
            sort(all(pos[i]));
            int p1 = pos[i][0];
            int p2 = pos[i][1];
            ans.pb(mp(p1,e));
            ans.pb(mp(p2,e));
            t[p1-m] = 0;
            t[p2-m] = 0;
            for(auto x : g[i]) {
                if(--in[x] == 0) {
                    ot[out[x]].pb(x);
                }
                else if(in[x] == 1) {
                    sort(all(pos[x]));
                    int j = t[pos[x][0]]+t[pos[x][1]];
                    // cout << x << " " << t[pos[x][0]] << " " << t[pos[x][1]] << endl;
                    ot[out[j]].pb(j);
                }
            }
            b[e] = i;
            t[e] = i;
            pos[i][0] = e;
            pos[i][1] = e+m;
        }
        else if(ept.size() && cntdone != n) {
            for(int j = 1; j <= m; j++) {
                if(b[j] != t[j]) {
                    int i = t[j];
                    int e = ept.back(); ept.pop_back();
                    sort(all(pos[i]));
                    ans.pb(mp(j,e));
                    t[j] = 0;
                    b[e] = i;
                    if(pos[i][0] == j+m) pos[i][0] = e;
                    else pos[i][1] = e;
                    if(--in[b[j]] == 0) {
                        ot[out[b[j]]].pb(b[j]);
                    }
                    assert((in[b[j]] == 0 && out[b[j]] == 1));
                    assert(g[i].size() == 1);
                    g[i].clear();
                    out[i] = 0;
                    break;
                }
            }
        }
        else {
            break;
        }
    }

    // if(m-n != 0) {
    //     assert(ept.size() != 0);
    // }

    for(int i = 1; i <= n; i++) {
        if(done[i] == 0) {
            cout << -1 << endl;
            return;
        }
    }
    cout << ans.size() << endl;
    for(auto x : ans) {
        if(x.fr > m) x.fr-= m;
        if(x.sc > m) x.sc-= m;
        cout << x.fr << " " << x.sc << endl;
    }


}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);

    // freopen("in.in", "r", stdin);
    // freopen("out.out", "w", stdout);
    int tt = 1;
    // cin >> tt;
    while(tt--) {
        solve();
    }

}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 19028 KB Output is correct
2 Correct 10 ms 19040 KB Output is correct
3 Correct 10 ms 19016 KB Output is correct
4 Correct 10 ms 19028 KB Output is correct
5 Correct 9 ms 19028 KB Output is correct
6 Correct 10 ms 19028 KB Output is correct
7 Correct 10 ms 19028 KB Output is correct
8 Correct 10 ms 19028 KB Output is correct
9 Correct 10 ms 19028 KB Output is correct
10 Correct 10 ms 19028 KB Output is correct

Subtask #2
2.0 / 10.0

# Verdict Execution time Memory Grader output
1 Partially correct 92 ms 31948 KB Output is partially correct
2 Partially correct 106 ms 33592 KB Output is partially correct
3 Partially correct 63 ms 29180 KB Output is partially correct
4 Partially correct 59 ms 29564 KB Output is partially correct
5 Partially correct 103 ms 33068 KB Output is partially correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 25 ms 38760 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Runtime error 25 ms 38760 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Partially correct 11 ms 19284 KB Output is partially correct
2 Correct 10 ms 19156 KB Output is correct
3 Partially correct 10 ms 19232 KB Output is partially correct
4 Runtime error 26 ms 38648 KB Execution killed with signal 11
5 Halted 0 ms 0 KB -

Subtask #6
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 19028 KB Output is correct
2 Correct 10 ms 19040 KB Output is correct
3 Correct 10 ms 19016 KB Output is correct
4 Correct 10 ms 19028 KB Output is correct
5 Correct 9 ms 19028 KB Output is correct
6 Correct 10 ms 19028 KB Output is correct
7 Correct 10 ms 19028 KB Output is correct
8 Correct 10 ms 19028 KB Output is correct
9 Correct 10 ms 19028 KB Output is correct
10 Correct 10 ms 19028 KB Output is correct
11 Partially correct 92 ms 31948 KB Output is partially correct
12 Partially correct 106 ms 33592 KB Output is partially correct
13 Partially correct 63 ms 29180 KB Output is partially correct
14 Partially correct 59 ms 29564 KB Output is partially correct
15 Partially correct 103 ms 33068 KB Output is partially correct
16 Runtime error 25 ms 38760 KB Execution killed with signal 11
17 Halted 0 ms 0 KB -