Submission #1303078

#	Time	Username	Problem	Language	Result	Execution time	Memory
1303078		trandangquang	Collecting Mushrooms (NOI18_collectmushrooms)	C++20	100 / 100	17 ms	22604 KiB

mushrooms

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

#define foru(i,a,b) for(int i=(a); i<=(b); ++i)
#define ford(i,a,b) for(int i=(a); i>=(b); --i)
#define rep(i,a) for(int i=0; i<(a); ++i)
#define sz(a) (int)(a).size()
#define all(a) (a).begin(),(a).end()
#define bit(s,i) (((s)>>(i))&1)
#define ii pair<int,int>
#define vi vector<int>
#define vii vector<ii>
#define fi first
#define se second
#define ll long long
#define eb emplace_back
#define pb push_back
#define __builtin_popcount __builtin_popcountll
#define _ << " " <<

template <class X, class Y> bool maxi(X &x, Y y){return x<y?x=y,true:false;}
template <class X, class Y> bool mini(X &x, Y y){return x>y?x=y,true:false;}

const int N=500500;

int r,c,d,k;
string s[N];
vector<int> sum[N];

void solve(){
    cin>>r>>c>>d>>k;
    foru(i,1,r){
        cin>>s[i];
        s[i]=" "+s[i];
    }

    foru(i,0,r+1) sum[i].resize(c+2,0);
    foru(i,1,r){
        foru(j,1,c){
            if(s[i][j]=='S'){
                int x=max(1,i-d), y=max(1,j-d), u=min(r,i+d), v=min(c,j+d);
                sum[x][y]++;
                sum[x][v+1]--;
                sum[u+1][y]--;
                sum[u+1][v+1]++;
            }
        }
    }

    int res=0;
    foru(i,1,r) foru(j,1,c){
        sum[i][j]+=sum[i-1][j]+sum[i][j-1]-sum[i-1][j-1];
        if(s[i][j]=='M') res+=sum[i][j]>=k;
    }

    cout<<res<<'\n';
}

int32_t main(){
    #define task "test"
    if(fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    cin.tie(0)->sync_with_stdio(0);

    int tc=1; //cin>>tc;
    foru(i,1,tc){
        solve();
    }
}

Compilation message (stderr)

mushrooms.cpp: In function 'int32_t main()':
mushrooms.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mushrooms.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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