oj.uz

Submission #434838

# Submission time Handle Problem Language Result Execution time Memory
434838 2021-06-21T22:35:57 Z 2qbingxuan Parachute rings (IOI12_rings) C++17
100 / 100
 2271 ms 136032 KB 
#include <bits/stdc++.h>
#ifdef local
#define debug(x...) qqbx(#x, x)
#define pary(x...) danb(#x, x)
#define safe std::cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
template <typename ...T> void qqbx(const char *s, T ...a) {
    int cnt = sizeof...(T);
    ((std::cerr << "(" << s << ") = ("), ..., (std::cerr << a << (--cnt ? ", " : ")\n")));
}
template <typename T> void danb(const char *t, T L, T R) {
    std::cerr << "[ " << t << " ] = [ ";
    for (int f = 0; L != R; ++L) std::cerr << (f++ ? ", " : "") << *L;
    std::cerr << " ]\n";
}
#else
#define debug(...) ((void)0)
#define pary(...) ((void)0)
#define safe ((void)0)
#endif // local

using namespace std;

// #include "lib1270.h"
const int maxn = 1000025, K = 4;
struct Dsu {
    int pa[maxn], sz[maxn];
    int deg[maxn];
    bool ok;
    // Dsu() { memset(pa, 0, sizeof pa); memset(sz, 0, sizeof sz); memset(deg, 0, sizeof deg); }
    void init(int n) {
        for (int i = 0; i < n; i++) pa[i] = i, sz[i] = 1, deg[i] = 0;
        ok = true;
    }
    int anc(int x) { return x==pa[x] ? x : pa[x]=anc(pa[x]); }
    bool join(int x, int y) {
        if (++deg[x] == 3) ok = false;
        if (++deg[y] == 3) ok = false;
        if ((x=anc(x)) == (y=anc(y))) return ok = false;
        if (sz[x] < sz[y]) swap(x, y);
        return pa[y] = x, sz[x] += sz[y];
    }
} dsu[K], org;
vector<int> cand;
pair<int,int> E[maxn];
vector<int> adj[maxn];
bool inCand[maxn];
int tot, N, cyc;
bool hasFour;
void Init(int _N) {
    N = _N;
    org.init(N);
    for (int i = 0; i < K; i++)
        dsu[i].init(N);
    for (int i = 0; i < N; i++)
        adj[i].clear();
    for (int i = 0; i < N; i++)
        inCand[i] = false;
    cand.clear();
    tot = 0;
    hasFour = false;
    cyc = 0;
}
void addCand(int x) {
    if (cand.size() >= K) return;
    if (inCand[x]) return;
    inCand[x] = true;
    int pos = cand.size();
    cand.push_back(x);
    for (int i = 0; i < tot; i++)
        if (x != E[i].first && x != E[i].second)
            dsu[pos].join(E[i].first, E[i].second);
}
void Link(int a, int b) {
    adj[a].push_back(b);
    adj[b].push_back(a);
    for (int x: {a, b}) {
        if (!hasFour && adj[x].size() == 4) {
            hasFour = true;
            debug("NO", x);
            pary(cand.begin(),cand.end());
            if (inCand[x]) continue;
            inCand[x] = true;
            debug("FOUR", x);
            if (cand.empty()) cand.push_back(7122);
            cand[0] = x;
            dsu[0].init(N);
            for (int i = 0; i < tot; i++)
                if (x != E[i].first && x != E[i].second)
                    dsu[0].join(E[i].first, E[i].second);
        }
    }
    if (adj[a].size() == 3) {
        addCand(a);
        for (int j: adj[a])
            addCand(j);
    }
    if (adj[b].size() == 3) {
        addCand(b);
        for (int j: adj[b])
            addCand(j);
    }
    E[tot++] = { a, b };
    for (int i = 0; i < cand.size(); i++)
        if (a != cand[i] && b != cand[i]) {
            dsu[i].join(a, b);
        }
    if (!org.join(a, b)) {
        debug(cyc, a, b);
        if (cyc)
            cyc = -1;
        else
            cyc = org.sz[org.anc(a)];
    }
}
int CountCritical() {
    if (cand.size() == 0) {
        debug(cyc);
        return cyc ? max(0, cyc) : N;
    }
    pary(cand.begin(),cand.end());
    int ans = 0;
    /*
    for (int i = 0; i < N; i++) {
        dsu[0].init(N);
        for (int j = 0; j < tot; j++) if (i != E[j].first && i != E[j].second) dsu[0].join(E[j].first, E[j].second);
        if (dsu[0].ok) ++ans;
    }
    */
    for (int i = 0; i < cand.size(); i++) if (dsu[i].ok) ++ans;
    return ans;
}
#ifdef local
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0);
    int n;
    cin >> n;
    Init(n);
    int q;
    cin >> q;
    while (q--) {
        char c;
        cin >> c;
        if (c == 'L') {
            int x, y;
            cin >> x >> y;
            Link(x, y);
        } else if (c == 'Q') {
            cout << CountCritical() << '\n';
        }
    }
}
#endif // local

/*
6
6
L 1 2
L 2 3
L 4 5
L 4 6
L 1 3
Q
 */

Compilation message

rings.cpp: In function 'void Link(int, int)':
rings.cpp:103:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  103 |     for (int i = 0; i < cand.size(); i++)
      |                     ~~^~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:129:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  129 |     for (int i = 0; i < cand.size(); i++) if (dsu[i].ok) ++ans;
      |                     ~~^~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23896 KB Output is correct
2 Correct 18 ms 24344 KB Output is correct
3 Correct 19 ms 24396 KB Output is correct
4 Correct 17 ms 23948 KB Output is correct
5 Correct 20 ms 24236 KB Output is correct
6 Correct 18 ms 24440 KB Output is correct
7 Correct 16 ms 24140 KB Output is correct
8 Correct 19 ms 24276 KB Output is correct
9 Correct 20 ms 24396 KB Output is correct
10 Correct 21 ms 24444 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 487 ms 75288 KB Output is correct
2 Correct 1928 ms 102960 KB Output is correct
3 Correct 2267 ms 130820 KB Output is correct
4 Correct 1310 ms 136000 KB Output is correct
5 Correct 1379 ms 136004 KB Output is correct
6 Correct 1248 ms 134068 KB Output is correct
7 Correct 2198 ms 129376 KB Output is correct
8 Correct 2120 ms 128784 KB Output is correct
9 Correct 2214 ms 136032 KB Output is correct
10 Correct 903 ms 133004 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23896 KB Output is correct
2 Correct 18 ms 24344 KB Output is correct
3 Correct 19 ms 24396 KB Output is correct
4 Correct 17 ms 23948 KB Output is correct
5 Correct 20 ms 24236 KB Output is correct
6 Correct 18 ms 24440 KB Output is correct
7 Correct 16 ms 24140 KB Output is correct
8 Correct 19 ms 24276 KB Output is correct
9 Correct 20 ms 24396 KB Output is correct
10 Correct 21 ms 24444 KB Output is correct
11 Correct 19 ms 24448 KB Output is correct
12 Correct 21 ms 24908 KB Output is correct
13 Correct 21 ms 25036 KB Output is correct
14 Correct 22 ms 24772 KB Output is correct
15 Correct 22 ms 25404 KB Output is correct
16 Correct 21 ms 25056 KB Output is correct
17 Correct 25 ms 25036 KB Output is correct
18 Correct 24 ms 25688 KB Output is correct
19 Correct 21 ms 25040 KB Output is correct
20 Correct 22 ms 24988 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23896 KB Output is correct
2 Correct 18 ms 24344 KB Output is correct
3 Correct 19 ms 24396 KB Output is correct
4 Correct 17 ms 23948 KB Output is correct
5 Correct 20 ms 24236 KB Output is correct
6 Correct 18 ms 24440 KB Output is correct
7 Correct 16 ms 24140 KB Output is correct
8 Correct 19 ms 24276 KB Output is correct
9 Correct 20 ms 24396 KB Output is correct
10 Correct 21 ms 24444 KB Output is correct
11 Correct 19 ms 24448 KB Output is correct
12 Correct 21 ms 24908 KB Output is correct
13 Correct 21 ms 25036 KB Output is correct
14 Correct 22 ms 24772 KB Output is correct
15 Correct 22 ms 25404 KB Output is correct
16 Correct 21 ms 25056 KB Output is correct
17 Correct 25 ms 25036 KB Output is correct
18 Correct 24 ms 25688 KB Output is correct
19 Correct 21 ms 25040 KB Output is correct
20 Correct 22 ms 24988 KB Output is correct
21 Correct 35 ms 28444 KB Output is correct
22 Correct 49 ms 31216 KB Output is correct
23 Correct 70 ms 33124 KB Output is correct
24 Correct 98 ms 32100 KB Output is correct
25 Correct 37 ms 30416 KB Output is correct
26 Correct 84 ms 32984 KB Output is correct
27 Correct 69 ms 33304 KB Output is correct
28 Correct 111 ms 33652 KB Output is correct
29 Correct 75 ms 32256 KB Output is correct
30 Correct 76 ms 34756 KB Output is correct

Subtask #5
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23896 KB Output is correct
2 Correct 18 ms 24344 KB Output is correct
3 Correct 19 ms 24396 KB Output is correct
4 Correct 17 ms 23948 KB Output is correct
5 Correct 20 ms 24236 KB Output is correct
6 Correct 18 ms 24440 KB Output is correct
7 Correct 16 ms 24140 KB Output is correct
8 Correct 19 ms 24276 KB Output is correct
9 Correct 20 ms 24396 KB Output is correct
10 Correct 21 ms 24444 KB Output is correct
11 Correct 487 ms 75288 KB Output is correct
12 Correct 1928 ms 102960 KB Output is correct
13 Correct 2267 ms 130820 KB Output is correct
14 Correct 1310 ms 136000 KB Output is correct
15 Correct 1379 ms 136004 KB Output is correct
16 Correct 1248 ms 134068 KB Output is correct
17 Correct 2198 ms 129376 KB Output is correct
18 Correct 2120 ms 128784 KB Output is correct
19 Correct 2214 ms 136032 KB Output is correct
20 Correct 903 ms 133004 KB Output is correct
21 Correct 19 ms 24448 KB Output is correct
22 Correct 21 ms 24908 KB Output is correct
23 Correct 21 ms 25036 KB Output is correct
24 Correct 22 ms 24772 KB Output is correct
25 Correct 22 ms 25404 KB Output is correct
26 Correct 21 ms 25056 KB Output is correct
27 Correct 25 ms 25036 KB Output is correct
28 Correct 24 ms 25688 KB Output is correct
29 Correct 21 ms 25040 KB Output is correct
30 Correct 22 ms 24988 KB Output is correct
31 Correct 35 ms 28444 KB Output is correct
32 Correct 49 ms 31216 KB Output is correct
33 Correct 70 ms 33124 KB Output is correct
34 Correct 98 ms 32100 KB Output is correct
35 Correct 37 ms 30416 KB Output is correct
36 Correct 84 ms 32984 KB Output is correct
37 Correct 69 ms 33304 KB Output is correct
38 Correct 111 ms 33652 KB Output is correct
39 Correct 75 ms 32256 KB Output is correct
40 Correct 76 ms 34756 KB Output is correct
41 Correct 255 ms 67432 KB Output is correct
42 Correct 865 ms 100040 KB Output is correct
43 Correct 386 ms 86596 KB Output is correct
44 Correct 1486 ms 126152 KB Output is correct
45 Correct 1467 ms 117780 KB Output is correct
46 Correct 852 ms 116972 KB Output is correct
47 Correct 1083 ms 118648 KB Output is correct
48 Correct 941 ms 109012 KB Output is correct
49 Correct 850 ms 125084 KB Output is correct
50 Correct 935 ms 123744 KB Output is correct
51 Correct 492 ms 81076 KB Output is correct
52 Correct 1284 ms 106684 KB Output is correct
53 Correct 973 ms 109492 KB Output is correct
54 Correct 1855 ms 115052 KB Output is correct
55 Correct 2271 ms 123168 KB Output is correct