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답안 #305239

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
305239 2020-09-22T18:59:50 Z pit4h The Kingdom of JOIOI (JOI17_joioi) C++14
60 / 100
 4000 ms 71488 KB 
#include<bits/stdc++.h>
using namespace std;
using ll = int;
const ll INF = 1e9+1;
bool possible(vector<vector<ll>>& grid, ll M, ll L, ll R) {
	int h = grid.size(), w = grid[0].size();
	vector<vector<bool>> dp(h, vector<bool>(w+1));
	dp[0][0] = 1;
	for(int i=0; i<h; ++i) {
		ll mx = L;
		if(i!=0) {
			dp[i][0] = dp[i-1][0];
		}
		for(int j=0; j<w; ++j) {
			mx = max(mx, grid[i][j]);
			if(i!=0) {
				dp[i][j+1] = dp[i][j+1] | dp[i-1][j+1];
			}
			dp[i][j+1] = dp[i][j+1] | dp[i][j];
			if(mx-L > M) dp[i][j+1] = 0;
		}
		ll mini = R;
		for(int j=w; j>=0; --j) {
			if(R-mini > M) dp[i][j] = 0;
			if(j-1>=0) mini = min(mini, grid[i][j-1]);
		}
	}
	bool res = 0;
	for(int i=0; i<w; ++i) {
		if(dp[h-1][i+1]) res = 1;
	}
	return res;
}
ll solve(vector<vector<ll>>& grid) {
	int h = grid.size(), w = grid[0].size();
	ll L = INF, R = 0;
	for(int i=0; i<h; ++i) {
		for(int j=0; j<w; ++j) {
			L = min(L, grid[i][j]);
			R = max(R, grid[i][j]);
		}
	}
	ll lo = 0, hi = R - L;
	ll res = INF;
	while(lo<=hi) {
		ll M = (lo+hi)/2;
		if(possible(grid, M, L, R)) {
			hi = M - 1;	
			res = M;
		}
		else {
			lo = M + 1;
		}
	}
	return res;
}
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int h, w; cin>>h>>w;
	vector<vector<ll>> grid(h, vector<ll>(w));
	for(int i=0; i<h; ++i) {
		for(int j=0; j<w; ++j) {
			cin>>grid[i][j];
		}
	}
	ll ans = INF;
	auto G = grid;
	ans = min(ans, solve(G));
	reverse(G.begin(), G.end());
	ans = min(ans, solve(G));
	for(int i=0; i<h; ++i) {
		reverse(G[i].begin(), G[i].end());	
	}
	ans = min(ans, solve(G));
	reverse(G.begin(), G.end());
	ans = min(ans, solve(G));	
	cout<<ans;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 11 ms 640 KB Output is correct
17 Correct 40 ms 732 KB Output is correct
18 Correct 41 ms 640 KB Output is correct
19 Correct 40 ms 640 KB Output is correct
20 Correct 36 ms 640 KB Output is correct
21 Correct 57 ms 728 KB Output is correct
22 Correct 57 ms 640 KB Output is correct
23 Correct 57 ms 640 KB Output is correct
24 Correct 53 ms 640 KB Output is correct
25 Correct 58 ms 640 KB Output is correct
26 Correct 58 ms 760 KB Output is correct
27 Correct 58 ms 640 KB Output is correct
28 Correct 57 ms 640 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 11 ms 640 KB Output is correct
17 Correct 40 ms 732 KB Output is correct
18 Correct 41 ms 640 KB Output is correct
19 Correct 40 ms 640 KB Output is correct
20 Correct 36 ms 640 KB Output is correct
21 Correct 57 ms 728 KB Output is correct
22 Correct 57 ms 640 KB Output is correct
23 Correct 57 ms 640 KB Output is correct
24 Correct 53 ms 640 KB Output is correct
25 Correct 58 ms 640 KB Output is correct
26 Correct 58 ms 760 KB Output is correct
27 Correct 58 ms 640 KB Output is correct
28 Correct 57 ms 640 KB Output is correct
29 Correct 3230 ms 31088 KB Output is correct
30 Correct 3149 ms 51816 KB Output is correct
31 Correct 3384 ms 55832 KB Output is correct
32 Correct 3417 ms 55672 KB Output is correct
33 Correct 2971 ms 48872 KB Output is correct
34 Correct 3410 ms 55896 KB Output is correct
35 Execution timed out 4103 ms 71488 KB Time limit exceeded
36 Halted 0 ms 0 KB -