Submission #741791

#	Time	Username	Problem	Language	Result	Execution time	Memory
741791		Joshua_Andersson	Parachute rings (IOI12_rings)	C++17	0 / 100	816 ms	83904 KiB

rings

#undef _GLIBCXX_DEBUG                // disable run-time bound checking, etc
#pragma GCC optimize("Ofast,inline") // Ofast = O3,fast-math,allow-store-data-races,no-protect-parens
#pragma GCC optimize ("unroll-loops")

#pragma GCC target("bmi,bmi2,lzcnt,popcnt")                      // bit manipulation
#pragma GCC target("movbe")                                      // byte swap
#pragma GCC target("aes,pclmul,rdrnd")                           // encryption
#pragma GCC target("avx,avx2,f16c,fma,sse3,ssse3,sse4.1,sse4.2") // SIMD

#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace std;

#define enablell 0

typedef long long ll;
typedef unsigned long long ull;
#if enablell
#define int ll
#define inf int(1e18)
#define float double
#else
const int inf = int(2e9);
#endif
typedef vector<ull> vull;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<vvvi> vvvvi;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;
typedef pair<int, int> p2;
typedef vector<p2> vp2;
typedef vector<vp2> vvp2;
typedef vector<vvp2> vvvp2;
typedef tuple<int, int, int> p3;
typedef vector<p3> vp3;
typedef vector<vp3> vvp3;
typedef vector<vvp3> vvvp3;
typedef tuple<int, int, int, int> p4;
typedef vector<p4> vp4;

#define PBDS 1
#define _LOCAL _MSC_VER > 0
#if _LOCAL
#define gc() getchar()
#define popcount(x) __popcnt(x)
#define leading_zeros(x) _lzcnt_u32(x)
uint32_t clz(uint32_t x) { return _lzcnt_u32(x); }
uint32_t ctz(uint32_t x) { return _tzcnt_u32(x); }
#define bswap64(x) _byteswap_uint64(x)
#define assert(x) debassert(x)
#else
#define popcount(x) __builtin_popcount(x)
uint32_t clz(uint32_t x) { return __builtin_clz(x); }
uint32_t ctz(uint32_t x) { return __builtin_ctzll(x); }
#define bswap64(x) __builtin_bswap64(x)
#define gc() getchar_unlocked()
#if PBDS
using namespace __gnu_pbds;
// lower_bound is now upper_bound and vice versa (multiset). generally a bit broken
template<typename T> using indexed_multiset = tree<int, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T> using indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
struct chash { // large odd number for C
    const uint64_t C = ll(4e18 * acos(0)) | 71;
    ll operator()(ll x) const { return __builtin_bswap64(x * C); }
};

template<typename T, typename U> using fast_map = __gnu_pbds::gp_hash_table<T, U, chash>;
template<typename T> using fast_set = __gnu_pbds::gp_hash_table<T, null_type, chash>;
template<typename T, typename H> using fast_set_h = __gnu_pbds::gp_hash_table<T, null_type, H>;
#endif

#endif

#define FAST_INPUT 0
#define FILE_TC 0
#if FILE_TC && _LOCAL
//ifstream filein("E:\\desktop\\code\\repos\\Comp prog\\x64\\Debug\\in.txt");
ifstream filein("C:\\users\\matis\\source\\repos\\comp_prog\\x64\\Release\\in.txt");
//ifstream filein("E:\\downloads\\test_data\\test_data\\005-case05.in");
//ifstream filein("E:\\desktop\\po-repos\\swedish-olympiad-2023\\online\\tomtplanering\\data\\secret\\group10\\010-case10.in");

#define cin filein
void fast() {}
#else
inline void fast() { ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); }
#endif

#if FAST_INPUT && (!FILE_TC || !_LOCAL)
inline void read(int& v) { v = 0; int sign = 1; char c = gc(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = gc()) && c != ' ' && c != '\n') { if (c == EOF) { v = -1; return; } v *= 10; v += c - '0'; } v *= sign; }
inline void read(int& u, int& v) { read(u); read(v); }
inline void read(int& u, int& v, int& k) { read(u); read(v); read(k); }
//inline void read(int& v) { char c; while ((c = getchar()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } }
inline void read(string& s) { char c; while ((c = gc()) != EOF && c != '\n' && c != ' ') { s.push_back(c); } }
inline void readline(string& s) { char c; while ((c = gc()) != EOF && c != '\n') { s.push_back(c); } }
#else
template <typename T> inline void read(T& a) { cin >> a; }
template <typename T> inline void read(T& a, T& b) { cin >> a >> b; }
template <typename T> inline void read(T& a, T& b, T& c) { cin >> a >> b >> c; }
#endif
#define quit cout << endl; _Exit(0);
#define dread(type, a) type a; read(a)
#define dread2(type, a, b) dread(type, a); dread(type, b)
#define dread3(type, a, b, c) dread2(type, a, b); dread(type, c)
#define dread4(type, a, b, c, d) dread3(type, a, b, c); dread(type, d)
#define dread5(type, a, b, c, d, e) dread4(type, a, b, c, d); dread(type, e)
#define readvector(type, name, size) vector<type> name(size); rep(i,size) {dread(type,temp); name[i]=temp;}
#ifdef _DEBUG
#define noop cout << "";
#define deb __debugbreak();
#define debassert(expr) if(!(expr)) deb;
#define debif(expr) if(expr) deb;
#else
#define noop ;
#define deb ;
#define debif(expr) ;
#define debassert(expr) ;
#endif

#define rep(i, high) for (int i = 0; i < high; i++)
#define repp(i, low, high) for (int i = low; i < high; i++)
#define repe(i, container) for (auto& i : container)
#define per(i, high) for (int i = high-1; i >= 0; i--)
#define perr(i, low, high) for (int i = high-1; i >= low; i--)

#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define setcontains(set, x) (set.find(x) != set.end())
#define within(a, b, c, d) (a >= 0 && a < b && c >= 0 && c < d)
#define sz(container) ((int)container.size())
#define mp(a,b) (make_pair(a,b))

#define ceildiv(x,y) ((x + y - 1) / y)

template <typename T, typename U> inline void operator+=(pair<T, U>& l, const pair<T, U>& r) { l = { l.first + r.first,l.second + r.second }; }
template <typename T, typename U> inline pair<T, U> operator+(const pair<T, U> l, const pair<T, U> r) { return { l.first + r.first, l.second + r.second }; }
template <typename T, typename U> inline pair<T, U> operator-(const pair<T, U> l, const pair<T, U> r) { return { l.first - r.first, l.second - r.second }; }
template <typename T, typename U> inline pair<T, U> operator*(const pair<T, U> l, const int m) { return { l.first * m, l.second * m }; }
template <typename Out> inline void split(const string& s, char delim, Out result) { istringstream iss(s); string item; while (getline(iss, item, delim)) { *result++ = item; } }
inline vector<string> split(const string& s, char delim) { vector<string> elems; split(s, delim, back_inserter(elems)); return elems; }
vector<string> split(string s, string d) { size_t k = 0, n, e = d.length(); string t; vector<string> r; while ((n = s.find(d, k)) != string::npos) { t = s.substr(k, n - k); k = n + e; r.push_back(t); } r.push_back(s.substr(k)); return r; }
ll binpow(ll a, ll b) { ll res = 1; while (b > 0) { if (b & 1) res = res * a; a = a * a; b >>= 1; } return res; }
ll binpow(ll a, ll b, ll m) { a %= m; long long res = 1; while (b > 0) { if (b & 1) res = res * a % m; a = a * a % m; b >>= 1; } return res; } // For a < 2^31

#if 1
auto Start = chrono::high_resolution_clock::now();
void resettimer() { Start = chrono::high_resolution_clock::now(); }
int elapsedmillis() { return chrono::duration_cast<chrono::milliseconds>(chrono::high_resolution_clock::now() - Start).count(); }
random_device rd;
mt19937 rng(rd());
template<typename T, typename U> inline int randint(T lo, U hi) { return uniform_int_distribution<int>((int)lo, (int)hi)(rng); } // [lo,hi]
template<typename T> inline T randel(vector<T>& v) { return v[uniform_int_distribution<int>(int(0), int(v.size()) - int(1))(rng)]; } // [lo,hi]
#endif
const ll mod = 1e9 + 7;
vp2 dirs = { {0,1},{0,-1},{1,0},{-1,0}, {0,0} };

int state = 0;
int numcycles = 0;
int cyclelen = -1;
int n;
vp2 edgelist;
vvi edges;


int findlen(int u, int p, int start)
{
    if (u == start && u != p) return 0;
    repe(e, edges[u])
    {
        if (e != p)
        {
            int k = findlen(e, u, start);
            if (k != -1) return k + 1;
        }
    }
    return -1;
}

struct UF
{
    int n;
    vi par;
    vi size;
    vi deg;
    bool isgood;
    bool hascycle;

    UF(int n) : n(n), par(n), size(n, 1), deg(n)
    {
        rep(i, n) par[i] = i;
    }

    int find(int x) { return x == par[x] ? x : par[x] = find(par[x]); }

    int merge(int a, int b)
    {
        deg[a]++;
        deg[b]++;
        if (deg[a] > 2 || deg[b] > 2)
        {
            state = 2;
            return 1;
        }

        if (find(a)==find(b))
        {
            if (numcycles==0)
            {
                numcycles++;
                cyclelen = findlen(a,a,a);
                hascycle = 1;
                state = 1;
            }
            else
            {
                state = 3;
            }
        }
        else
        {
            a = find(a);
            b = find(b);
            if (size[a] < size[b]) swap(a, b);
            par[b] = a;
            size[a] += size[b];
        }
        return 0;
    }
};

struct UF2
{
    int n;
    vi par;
    vi size;
    vi deg;
    bool isgood;
    bool hascycle;
    int excluded = -1;

    UF2(int n) : n(n), par(n), size(n, 1), deg(n)
    {
        rep(i, n) par[i] = i;
    }

    int find(int x) { return x == par[x] ? x : par[x] = find(par[x]); }

    void merge(int a, int b)
    {
        if (a == excluded || b == excluded) return;
        deg[a]++;
        deg[b]++;

        if (deg[a] > 2 || deg[b] > 2) isgood = 0;
        if (find(a)==find(b))
        {
            isgood = 0;
        }
        else
        {
            a = find(a);
            b = find(b);
            if (size[a] < size[b]) swap(a, b);
            par[b] = a;
            size[a] += size[b];
        }
    }
};

UF uf = UF(0);
vector<UF2> nodes;
void Init(int s)
{
    n = s;
    uf = UF(n);
    
    rep(i, 4) nodes.push_back(UF2(n));
    edges.resize(n);
}

void Link(int a, int b)
{
    edgelist.emplace_back(a, b);
    edges[a].emplace_back(b);
    edges[b].emplace_back(a);
    if (state<2)
    {
        if (uf.merge(a,b))
        {
            int d3 = -1;
            rep(i, n) if (uf.deg[i] == 3) d3 = i;

            nodes[0].excluded = d3;
            rep(i, 3)
            {
                nodes[i + 1].excluded = edges[d3][i];
            }

            repe(e, edgelist)
            {
                rep(i, 4)
                {
                    nodes[i].merge(e.first, e.second);
                }
            }

            rep(i, nodes.size())
            {
                if (!nodes[i].isgood)
                {
                    nodes.erase(begin(nodes) + i);
                    i--;
                }
            }
        }
    }
    else
    {
        rep(i, nodes.size())
        {
            nodes[i].merge(a, b);
            if (!nodes[i].isgood)
            {
                nodes.erase(begin(nodes) + i);
                i--;
            }
        }
    }
}

int CountCritical()
{
    if (state==0)
    {
        return n;
    }
    else if (state==1)
    {
        return cyclelen;
    }
    else if (state==2)
    {
        return nodes.size();
    }
    return 0;
}

#if _LOCAL
int32_t main()
{
    fast();

    dread2(int, n,q);
    Init(n);
    rep(i, q)
    {
        dread2(int, a, b);
        Link(a, b);
        cout << CountCritical() << "\n";
    }


    quit;
}
#endif

Compilation message (stderr)

rings.cpp: In function 'void Link(int, int)':
rings.cpp:122:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<UF2>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 | #define rep(i, high) for (int i = 0; i < high; i++)
......
  309 |             rep(i, nodes.size())
      |                 ~~~~~~~~~~~~~~~         
rings.cpp:309:13: note: in expansion of macro 'rep'
  309 |             rep(i, nodes.size())
      |             ^~~
rings.cpp:122:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<UF2>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 | #define rep(i, high) for (int i = 0; i < high; i++)
......
  321 |         rep(i, nodes.size())
      |             ~~~~~~~~~~~~~~~             
rings.cpp:321:9: note: in expansion of macro 'rep'
  321 |         rep(i, nodes.size())
      |         ^~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 17
• Subtask 3: 0 / 18
• Subtask 4: 0 / 14
• Subtask 5: 0 / 31