Submission #1135188

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135188		steveonalex	Collecting Mushrooms (NOI18_collectmushrooms)	C++20	100 / 100	7 ms	6896 KiB

mushrooms

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define MASK(i) (1LL << (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 gcd(ll a, ll b){return __gcd(a, b);}
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ll mask){return __builtin_ctzll(mask);}
int logOf(ll mask){return __lg(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"){
        for(auto item: container) cout << item << separator;
        cout << finish;
    }


template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

void solve(){
    int n, m, d, k; cin >> n >> m >>d >> k;
    vector<string> grid(n+1);
    for(int i = 1; i<= n; ++i){
        cin >> grid[i];
        grid[i] = "." + grid[i];
    }

    int sum[n+2][m+2]; memset(sum, 0, sizeof sum);
    for(int i = 1; i<= n; ++i) for(int j= 1; j <= m; ++j) if (grid[i][j] == 'S'){
        int u = i - d, v = j - d, x = i + d, y = j + d;
        minimize(x, n); minimize(y, m);
        maximize(u, 1); maximize(v, 1);
        sum[u][v]++;
        sum[u][y+1]--;
        sum[x+1][v]--;
        sum[x+1][y+1]++;
    }

    int ans = 0;
    for(int i = 1; i <= n; ++i) for(int j = 1;j<=m; ++j){
        sum[i][j] += sum[i-1][j] + sum[i][j-1] - sum[i-1][j-1];
        if (sum[i][j] >= k && grid[i][j] == 'M') ans++;
    }
    cout << ans << "\n";
}
int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    clock_t start = clock();

    solve();

    cerr << "Time elapsed: " << clock() - start << "ms!\n";
    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 23 / 23
• Subtask 5: 19 / 19
• Subtask 6: 21 / 21