Submission #690520

#	Time	Username	Problem	Language	Result	Execution time	Memory
690520		Kalashnikov	Luxury burrow (IZhO13_burrow)	C++17	100 / 100	583 ms	4372 KiB

burrow

#include <bits/stdc++.h>
 
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
 
using namespace std;
using ll = long long;
 
const int N = 1000+5 , inf = 2e9 + 7;
const ll INF = 1e18 ,   mod = 1e9+7 , P = 6547;

int a[N][N];
int dp[N][N];
int p[N];
int L[N] , R[N];


void solve(int tc) {
	int n , m, k;
	cin >> n >> m >> k;
	for(int i = 1; i <= n; i ++) {
		for(int j = 1; j <= m; j ++) {
			cin >> a[i][j];
		}
	}
	int l = 1, r = 1e9;
	int ans, mxs;
	while(l <= r) {
		int md = l+r >> 1;
		fill(p+1 , p+m+1 , 0);
		int mx = 0;
		for(int i = 1; i <= n; i ++) {
			for(int j = 1; j <= m; j ++) {
				int c = (a[i][j] >= md);
				if(c == 0) {
					p[j] = 0;
				}
				else {
					p[j] ++;
				}
			}
			stack<int> st;
			st.push(0); p[0] = -1;
			for(int j = 1; j <= m; j ++) {
				while(st.size() && p[st.top()] >= p[j]) {
					st.pop();
				}
				L[j] = st.top();
				st.push(j);
			}
			while(st.size()) st.pop();
			
			st.push(m+1); p[m+1] = -1;
			for(int j = m; j >= 1; j --) {
				while(st.size() && p[st.top()] >= p[j]) {
					st.pop();
				}
				R[j] = st.top();
				st.push(j);
			}
			for(int j = 1; j <= m; j ++) {
				mx = max(mx, (R[j]-L[j]-1)*p[j]);
			}
		}
		
		if(mx >= k) {
			ans = md;
			mxs = mx;
			l = md+1;
		}
		else {
			r = md-1;
		}
	}
	cout << ans << ' ' << mxs;
}
/*
*/
main() {
    ios;
    int tt = 1 , tc = 0;
    // cin >> tt;
    while(tt --) {
        solve(++tc);
    }
    return 0;
}

Compilation message (stderr)

burrow.cpp: In function 'void solve(int)':
burrow.cpp:32:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   32 |   int md = l+r >> 1;
      |            ~^~
burrow.cpp: At global scope:
burrow.cpp:82:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   82 | main() {
      | ^~~~
burrow.cpp: In function 'void solve(int)':
burrow.cpp:78:24: warning: 'mxs' may be used uninitialized in this function [-Wmaybe-uninitialized]
   78 |  cout << ans << ' ' << mxs;
      |                        ^~~
burrow.cpp:78:17: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   78 |  cout << ans << ' ' << mxs;
      |                 ^~~

• Subtask 1: 100 / 100