Submission #651070

#	Time	Username	Problem	Language	Result	Execution time	Memory
651070		dooompy	Love Polygon (BOI18_polygon)	C++17	100 / 100	276 ms	24260 KiB

polygon

    #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>
    using namespace std;
     
    #define enablell 0
     
    typedef long long ll;
    #if enablell
    #define int ll
    #define inf int(1e18)
    #define float double
    #else
    const int inf = int(2e9);
    #endif
    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 _LOCAL _MSC_VER > 0
    #if _LOCAL
    #define gc() getchar()
    #define popcount(x) __popcnt(x)
    #define leading_zeros(x) _lzcnt_u32(x)
    #define assert(x) debassert(x)
    #else
    #define popcount(x) __builtin__popcount(x)
    #define leading_zeros(x) __builtin_clz(x)
    #define gc() getchar_unlocked()
    #if 0
    #include <bits/extc++.h>
    using namespace __gnu_pbds;
    struct chash { // large odd number for C
        const uint64_t C = ll(4e18 * acos(0)) | 71;
        ll operator()(ll x) const { return x; }
    };
    //typedef __gnu_pbds::gp_hash_table<int, null_type, chash> h;
    #endif
     
    #endif
     
    #define FILE_TC 0
    #if FILE_TC
    ifstream filein("C:\\Users\\Matis\\source\\repos\\Comp prog\\x64\\Debug\\in.txt");
    #define cin filein
    //ifstream cin("C:\\Users\\Matis\\desktop\\po-two\\swedish-olympiad-2014\\");
    void fast() {}
    #else
    inline void fast() { ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); }
    #endif
     
    #if !FILE_TC
    inline void read(int& v) { v = 0; int sign = 1; char c = gc(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = gc()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } v *= sign; }
    inline void read(int& u, int& v) { read(u); read(v); }
    //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); } }
    #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
    template <typename T> inline void write(T& a) { cout << (a) << "\n"; }
    #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 debassert(expr) ;
    #define debif(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 revall(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 first(a) (*begin(a))
    #define indexpair(p, i) ((i==0)?p.first:p.second)
    #define chmax(a,b) ((a)=max((a),b))
    #define chmin(a,b) ((a)=min((a),b))
     
    #define ceildiv(x,y) ((x + y - 1) / y)
    #define fract(a) (a-floor(a))
     
    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; }
     
    #if 0
    auto Start = chrono::high_resolution_clock::now();
    #define elapsedmillis() (chrono::duration_cast<chrono::milliseconds>(chrono::high_resolution_clock::now() - Start).count())
    #define rununtil(time) if (elapsedmillis() >= time) break;
    random_device rd;
    mt19937 rng(rd());
    #endif
    const int mod = 1e9 + 7;
     
    struct node
    {
        int edge;
        set<int> redges;
        node() : edge(-1){}
    };
     
    void dfs(int u, vi& ret, vb& vis, vector<node>& edges)
    {
        if (vis[u]) return;
        vis[u] = true;
        ret.push_back(u);
        dfs(edges[u].edge, ret, vis, edges);
    }
     
    int32_t main()
    {
        fast();
     
        int nodenum = 0;
        map<string, int> nametonode;
     
        vector<node> edges;
     
        dread(int, n);
        if (n % 2 == 1)
        {
            cout << "-1";
            quit;
        }
     
        vb mated(n);
        rep(i,n)
        {
            dread2(string, a, b);
            if (!nametonode.count(a)) nametonode[a] = nodenum++;
            if (!nametonode.count(b)) nametonode[b] = nodenum++;
     
            int u = nametonode[a];
            int v = nametonode[b];
            while (max(u, v) >= edges.size()) edges.push_back({});
     
     
     
            edges[u].edge = v;
            edges[v].redges.insert(u);
     
            if (u!=v&&edges[v].edge==u)
            {
                mated[u] = 1;
                mated[v] = 1;
            }
        }
     
        queue<int> leafs;
        rep(i, edges.size())
        {
            if (edges[i].redges.size()==0)
            {
                leafs.push(i);
            }
        }
     
        
     
        set<int> loners;
     
        int ans = 0;
        while (leafs.size())
        {
            int u = leafs.front();
            leafs.pop();
     
            if (mated[edges[u].edge])
            {
                loners.insert(u);
            }
            else
            {
                int target = edges[u].edge;
                int targetsq = edges[target].edge;
                edges[targetsq].redges.erase(target);
                if (edges[targetsq].redges.size()==0)
                {
                    leafs.push(targetsq);
                }
                mated[u] = 1;
                mated[target] = 1;
                ans++;
            }
     
        }
     
        // All that is left is loners and cycles
        // Loners != cycles of len 1
     
        // Find all cycles
        vvi cycles;
        vb vis(mated);
        rep(i, nodenum)
        {
            if (vis[i]||setcontains(loners,i)) continue;
            vi cycle;
            dfs(i, cycle, vis, edges);
            cycles.push_back(cycle);
        }
      
      int lonersz = loners.size();
     
        rep(i, cycles.size())
        {
            if (cycles[i].size()==1)
            {
                lonersz++;
            }
            else if (cycles[i].size()>2)
            {
                ans += cycles[i].size() / 2;
                if (cycles[i].size() % 2 == 1)
                {
                    lonersz++;
                }
            }
        }
     
            ans += lonersz;
      cout << ans;

     
        quit;
    }

Compilation message (stderr)

polygon.cpp: In function 'int32_t main()':
polygon.cpp:179:30: warning: comparison of integer expressions of different signedness: 'const int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  179 |             while (max(u, v) >= edges.size()) edges.push_back({});
      |                    ~~~~~~~~~~^~~~~~~~~~~~~~~
polygon.cpp:103:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  103 |     #define rep(i, high) for (int i = 0; i < high; i++)
......
  194 |         rep(i, edges.size())
      |             ~~~~~~~~~~~~~~~                 
polygon.cpp:194:9: note: in expansion of macro 'rep'
  194 |         rep(i, edges.size())
      |         ^~~
polygon.cpp:103:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  103 |     #define rep(i, high) for (int i = 0; i < high; i++)
......
  248 |         rep(i, cycles.size())
      |             ~~~~~~~~~~~~~~~~                
polygon.cpp:248:9: note: in expansion of macro 'rep'
  248 |         rep(i, cycles.size())
      |         ^~~

• Subtask 1: 21 / 21
• Subtask 2: 25 / 25
• Subtask 3: 29 / 29
• Subtask 4: 25 / 25