Submission #925696

#	Time	Username	Problem	Language	Result	Execution time	Memory
925696		vjudge1	Collecting Mushrooms (NOI18_collectmushrooms)	C++17	79 / 100	179 ms	262144 KiB

mushrooms

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define ll long long
#define pb push_back
#define emb emplace_back
#define emc emplace
#define pii pair<int,int>
#define pll pair<ll,ll>
#define F first
#define S second
template <class type_key, class type_val>
using um = unordered_map<type_key, type_val>;
template <class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <class T>
using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

signed main(void)
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);

	int n, m, d, k;
	cin >> n >> m >> d >> k;

	vector<array<int,4>> evs;
	for( int i = 1; i <= n; i++ ) {
		for( int j = 1; j <= m; j++ ) {
			char c;
			cin >> c;
			if( c == 'S') {
				int col1 = max(j - d, 1);
				bool k = (j + d + 1 > m);
				int col2 = min(j + d + 1, m);
				
				for( int row = max(1, i-d); row <= min(i+d,n); row++ ) {
					evs.pb({row,col1,0,+1});
					if( k ) evs.pb({row,col2,2,-1});
					else evs.pb({row,col2,0,-1});
				}
			}
			else if( c == 'M') {
				evs.pb({i,j,1,0});
			}
		}
	}
	sort(evs.begin(), evs.end()); 

	int spr = 0;
	int ans = 0;

	for( int i = 0; i < evs.size(); i++ ) {
		if( evs[i][2] == 1 ) {
			if( spr >= k ) ans++;
		} spr += evs[i][3];
	}
	cout << ans;

return 0;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int main()':
mushrooms.cpp:56:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 4> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |  for( int i = 0; i < evs.size(); i++ ) {
      |                  ~~^~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 23 / 23
• Subtask 5: 19 / 19
• Subtask 6: 0 / 21