Submission #542889

#	Time	Username	Problem	Language	Result	Execution time	Memory
542889		Aldas25	Dango Maker (JOI18_dango_maker)	C++14	13 / 100	1 ms	340 KiB

dango_maker

/*
//#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
*/

#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define pb push_back
#define f first
#define s second
typedef long double ld;
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int MAXN = 500100, MAXK = 20;
const ll INF = 1e16;
//const ll MOD = 1e9+7;
//const ll MOD = 998244353;

void setIO()
{
    FAST_IO;
}

void setIO(string s)
{
    FAST_IO;
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

int par[3100*3100];
int cnt[3100*3100][3];
int find (int a) {return par[a] = par[a]==a ? a : find(par[a]);}
bool same (int a, int b) {
    return find (a) == find(b);
}
void unite (int a, int b) {
    a = find(a);
    b = find(b);
    if (a == b) return;
    par[b] = a;
    FOR(i, 0, 2) cnt[a][i] += cnt[b][i];
}

int n, m;
char grid[3100][3100];

int id (int i, int j) {
    return i * m + j;
}

int main()
{
    setIO();

    cin >> n >> m;
    FOR(i, 0, n-1) FOR(j, 0, m-1) cin >> grid[i][j];

    FOR(i, 0, n-1) FOR(j, 0, m-1) {
        int ind = id(i,j);
        par[ind] = ind;
        int c = (grid[i][j]=='R') ? 0 : ((grid[i][j]=='G') ? 1 : 2);
        cnt[ind][c]++;
    }

    FOR(i, 0, n-1) FOR(j, 0, m-1) {
        if (i+2 <= n-1) {
            if (grid[i][j] == 'R' && grid[i+1][j] == 'G' && grid[i+2][j] == 'W') {
                unite(id(i,j), id(i+1, j));
                unite(id(i,j), id(i+2, j));
            }
        }
        if (j+2 <= m-1) {
            if (grid[i][j] == 'R' && grid[i][j+1] == 'G' && grid[i][j+2] == 'W') {
                unite(id(i,j), id(i, j+1));
                unite(id(i,j), id(i, j+2));
            }
        }
    }

    int ans = 0;
    FOR(i, 0, n-1) FOR(j, 0, m-1) {
        int ind = id (i,j);
        if (find(ind) != ind) continue;
        //cout << " i = " << i << " j = " << j;
        int cur = min(cnt[ind][1], cnt[ind][0]);
        cur = min(cur, cnt[ind][2]);
        ans += cur;
        //cout << "   cur = " << cur << endl;
        //FOR(c, 0, 2) cout << "   cnt c =" << c << " cnt=" << cnt[ind][c] << endl;
    }

    cout << ans << "\n";

    return 0;
}

Compilation message (stderr)

dango_maker.cpp: In function 'void setIO(std::string)':
dango_maker.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp:38:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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