Submission #988193

#	Time	Username	Problem	Language	Result	Execution time	Memory
988193		steveonalex	Dango Maker (JOI18_dango_maker)	C++17	13 / 100	1 ms	604 KiB

dango_maker

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

struct DSU{
    int n;
    vector<int> parent, sz;

    DSU(int _n){
        n = _n;
        parent.resize(n); sz.resize(n, 1);
        for(int i = 0; i<n; ++i) parent[i] = i;
    }

    int find_set(int u){return (u == parent[u]) ? u : (parent[u] = find_set(parent[u]));}
    bool same_set(int u, int v){return find_set(u) == find_set(v);}

    bool join_set(int u, int v){
        u = find_set(u), v = find_set(v);
        if (u != v){
            if (sz[u] < sz[v]) swap(u, v);
            parent[v] = u;
            sz[u] += sz[v];
            return true;
        }
        return false;
    }

    int get_size(int u){return sz[find_set(u)];}
};

int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n, m; cin >> n >> m;
    vector<string> s(n);
    for(int i = 0; i<n; ++i) cin >> s[i];

    DSU mst(n * m);
    for(int i = 0; i<n; ++i) for(int j = 0; j<m; ++j) if (s[i][j] == 'G'){
        int cur = i * m + j;
        if (i > 0 && i + 1 < n && s[i-1][j] == 'R' && s[i+1][j] == 'W'){
            mst.join_set(cur - m, cur + m);
        }
        if (j > 0 && j + 1 < m && s[i][j-1] == 'R' && s[i][j+1] == 'W'){
            mst.join_set(cur - 1, cur + 1);
        }
    }

    int ans = 0;
    for(int i = 0; i<n*m; ++i) if (i == mst.find_set(i)){
        ans += mst.get_size(i) / 2;
    }

    cout << ans << "\n";

    return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67