oj.uz

답안 #167418

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
167418 2019-12-08T12:10:02 Z cbertram The Kingdom of JOIOI (JOI17_joioi) C++14
100 / 100
 2797 ms 133388 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<bool> vb;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<string> vs;
typedef vector<vb> vvb;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
#define all(x) x.begin(), x.end()
#define rep(i,a,b) for(int i = a; i < b; i++)

int min_above(vi& arr, int key, int l, int r) {
  while(l < r) {
    int m = (l+r)/2;
    if(arr[m] <= key)
      l = m+1;
    else
      r = m;
  }
  return r;
}

int search_best(int H, int W, vi& vmin1, vi& vmax1, vi& vmin2, vi& vmax2) {
  int from = 0;
  int to = 1000000000;
  int bestUntilNow = 1000000000;
  while(from <= to) {
    int mid = (from+to)/2;

    int min1, min2, max1, max2;
    min1 = min2 = 1000000001;
    max1 = max2 = 0;
    rep(h,0,H) {
      int i = min_above(vmax1, mid, h*W, (h+1)*W);
      //if(mid == 24) cerr << h << ": " << i/W << ", " << i%W << '\n';
      if(i > h*W) {
	min1 = min(min1, vmin1[i-1]);
	max1 = max(max1, vmax1[i-1]);
      }
      if(i < (h+1)*W) {
	min2 = min(min2, vmin2[i]);
	max2 = max(max2, vmax2[i]);
      }
    }
    
    int res1 = max1-min1;
    int res2 = max2-min2;
    //if(vmin1[0] == 18) cerr << "mid = " << mid << ", (from, to) = (" << from << ", " << to << "), (res1, res2) = (" << res1 << ", " << res2 <<")\n";
    bestUntilNow = min(bestUntilNow, max(res1, res2));
    if(min1 == 0 || min2 == 0 || res1 < res2)
      from = mid+1;
    else
      to = mid-1;
  }
  return bestUntilNow;
}

int min_above2(vi& arr, int key, int l, int r) {
  while(l < r) {
    int m = (l+r)/2;
    if(arr[m] >= key)
      l = m+1;
    else
      r = m;
  }
  return r;
}

int search_best2(int H, int W, vi& vmin1, vi& vmax1, vi& vmin2, vi& vmax2) {
  int from = 0;
  int to = 1000000000;
  int bestUntilNow = 1000000000;
  while(from < to) {
    int mid = (from+to)/2;

    int min1, min2, max1, max2;
    min1 = min2 = 1000000001;
    max1 = max2 = 0;
    rep(h,0,H) {
      int i = min_above2(vmin1, mid, h*W, (h+1)*W);
      if(i > h*W) {
	min1 = min(min1, vmin1[i-1]);
	max1 = max(max1, vmax1[i-1]);
      }
      if(i < (h+1)*W) {
	min2 = min(min2, vmin2[i]);
	max2 = max(max2, vmax2[i]);
      }
    }
    
    int res1 = max1-min1;
    int res2 = max2-min2;
    bestUntilNow = min(bestUntilNow, max(res1, res2));
    if(max1 == 0 || max2 == 0 || res1 < res2)
      from = mid+1;
    else
      to = mid-1;
  }
  return bestUntilNow;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  int H, W;
  cin >> H;
  cin >> W;
  vi alt1(H*W);
  rep(h,0,H)
    rep(w,0,W) cin >> alt1[w+h*W];

  vi max1(H*W);
  vi min1(H*W);
  vi max2(H*W);
  vi min2(H*W);
  vi alt(H*W);
  int ans = 1000000000;
  rep(j,0,2) {
    rep(i,0,4) {
      if(i == 0) rep(h,0,H) rep(w,0,W) alt[w+h*W] = alt1[w+h*W];
      if(i == 1) rep(h,0,H) rep(w,0,W) alt[w+h*W] = alt1[W-1-w+h*W];
      if(i == 2) rep(h,0,H) rep(w,0,W) alt[w+h*W] = alt1[w+(H-1-h)*W];
      if(i == 3) rep(h,0,H) rep(w,0,W) alt[w+h*W] = alt1[W-1-w+(H-1-h)*W];	
      rep(h,0,H) {
	rep(w,0,W) {
	  max1[w+h*W] = alt[w+h*W];
	  if(w > 0) max1[w+h*W] = max(max1[w+h*W], max1[w-1+h*W]);
	  if(h > 0) max1[w+h*W] = max(max1[w+h*W], max1[w+(h-1)*W]);
	}
      }
      rep(h,0,H) {
	rep(w,0,W) {
	  min1[w+h*W] = alt[w+h*W];
	  if(w > 0) min1[w+h*W] = min(min1[w+h*W], min1[w-1+h*W]);
	  if(h > 0) min1[w+h*W] = min(min1[w+h*W], min1[w+(h-1)*W]);
	}
      }
      rep(h,0,H) {
	rep(w1,0,W) {
	  int w = W-1-w1;
	  max2[w+h*W] = alt[w+h*W];
	  if(w < W-1) max2[w+h*W] = max(max2[w+h*W], max2[w+1+h*W]);
	}
      }
      rep(h,0,H) {
	rep(w1,0,W) {
	  int w = W-1-w1;
	  min2[w+h*W] = alt[w+h*W];
	  if(w < W-1) min2[w+h*W] = min(min2[w+h*W], min2[w+1+h*W]);
	}
      }
      int res;
      if(j == 0) res = search_best(H,W,min1,max1,min2,max2);
      if(j == 1) res = search_best2(H,W,min1,max1,min2,max2);
      //cerr << res << '\n';
      ans = min(ans, res);
    }
  }
  cout << ans << '\n';;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 1 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 380 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 7 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 504 KB Output is correct
14 Correct 2 ms 376 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 1 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 380 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 7 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 504 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 4 ms 376 KB Output is correct
16 Correct 24 ms 1272 KB Output is correct
17 Correct 28 ms 1680 KB Output is correct
18 Correct 28 ms 1528 KB Output is correct
19 Correct 28 ms 1656 KB Output is correct
20 Correct 25 ms 1396 KB Output is correct
21 Correct 45 ms 1912 KB Output is correct
22 Correct 30 ms 1704 KB Output is correct
23 Correct 32 ms 1656 KB Output is correct
24 Correct 26 ms 1636 KB Output is correct
25 Correct 29 ms 1656 KB Output is correct
26 Correct 30 ms 1656 KB Output is correct
27 Correct 29 ms 1788 KB Output is correct
28 Correct 30 ms 1784 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 1 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 380 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 7 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 504 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 4 ms 376 KB Output is correct
16 Correct 24 ms 1272 KB Output is correct
17 Correct 28 ms 1680 KB Output is correct
18 Correct 28 ms 1528 KB Output is correct
19 Correct 28 ms 1656 KB Output is correct
20 Correct 25 ms 1396 KB Output is correct
21 Correct 45 ms 1912 KB Output is correct
22 Correct 30 ms 1704 KB Output is correct
23 Correct 32 ms 1656 KB Output is correct
24 Correct 26 ms 1636 KB Output is correct
25 Correct 29 ms 1656 KB Output is correct
26 Correct 30 ms 1656 KB Output is correct
27 Correct 29 ms 1788 KB Output is correct
28 Correct 30 ms 1784 KB Output is correct
29 Correct 2430 ms 111904 KB Output is correct
30 Correct 2298 ms 108920 KB Output is correct
31 Correct 2488 ms 117348 KB Output is correct
32 Correct 2491 ms 117492 KB Output is correct
33 Correct 2202 ms 102528 KB Output is correct
34 Correct 2499 ms 117624 KB Output is correct
35 Correct 2618 ms 133000 KB Output is correct
36 Correct 2377 ms 116120 KB Output is correct
37 Correct 2797 ms 133388 KB Output is correct