oj.uz

Submission #68278

# Submission time Handle Problem Language Result Execution time Memory
68278 2018-08-16T10:59:54 Z BThero The Kingdom of JOIOI (JOI17_joioi) C++17
15 / 100
 46 ms 5048 KB 
// Why I am so dumb? :c
#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair

#define all(x) (x).begin(), (x).end()

#define fi first
#define se second

using namespace std;

typedef long long ll;

const int MAXN = (int)2e3 + 3;

pair<int, int> pref[MAXN][MAXN];

pair<int, int> suff[MAXN][MAXN];

int newArr[MAXN][MAXN];

int arr[MAXN][MAXN];

int rl[MAXN * MAXN];

int n, m, k, ans;

void compress() {
	vector<int> vv;

	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= m; ++j) {
			vv.pb(arr[i][j]);
		}
	}

	sort(all(vv));
	vv.resize(unique(all(vv)) - vv.begin());

	k = vv.size();

	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= m; ++j) {
			int ps = upper_bound(all(vv), arr[i][j]) - vv.begin();
			rl[ps] = arr[i][j];
			arr[i][j] = ps;
		}
	}
}

bool goPrefL(int lim) {
	int ptr = m, cur = 0, cur2 = 0;

    for (int i = 1; i <= n; ++i) {
    	while (ptr > 0 && pref[i][ptr].se < lim) {
    		--ptr;
    	}

    	if (ptr < 1) {
    		break;
    	}

    	cur = max(cur, pref[i][ptr].fi);

    	if (ptr < m) {
    		cur2 = max(cur2, suff[i][ptr + 1].fi);
    	}
    }

    if (ptr > 0 && cur == k) {
    	ans = min(ans, max(rl[k] - rl[lim], rl[cur2] - rl[1]));
    	return 1;
    }	
    
    return 0;
}

bool goSuffL(int lim) {
	int ptr = 1, cur = 0, cur2 = 0;

    for (int i = 1; i <= n; ++i) {
    	while (ptr <= m && suff[i][ptr].se < lim) {
    		++ptr;
    	}

    	if (ptr > m) {
    		break;
    	}

    	cur = max(cur, suff[i][ptr].fi);

    	if (ptr > 1) {
    		cur2 = max(cur2, pref[i][ptr - 1].fi);
    	}
    }

    if (ptr <= m && cur == k) {
    	ans = min(ans, max(rl[k] - rl[lim], rl[cur2] - rl[1]));
    	return 1;
    }	
    
    return 0;
}

bool goPrefR(int lim) {
	int ptr = m, cur = k + 1, cur2 = k + 1;
			
    for (int i = 1; i <= n; ++i) {
    	while (ptr > 0 && pref[i][ptr].fi > lim) {
    		--ptr;
    	}

    	if (ptr < 1) {
    		break;
    	}

    	cur = min(cur, pref[i][ptr].se);

    	if (ptr < m) {
    		cur2 = min(cur2, suff[i][ptr + 1].se);
    	}
    }

    if (ptr > 0 && cur == 1) {
    	ans = min(ans, max(rl[lim] - rl[1], rl[k] - rl[cur2]));
    	return 1;
	}

	return 0;
}

bool goSuffR(int lim) {
    int ptr = 1, cur = k + 1, cur2 = k + 1;

    for (int i = 1; i <= n; ++i) {
    	while (ptr <= m && suff[i][ptr].fi > lim) {
    		++ptr;
    	}

    	if (ptr > m) {
    		break;
    	}

    	cur = min(cur, suff[i][ptr].se);

    	if (ptr > 1) {
    		cur2 = min(cur2, pref[i][ptr - 1].se);
    	}
    }

    if (ptr <= m && cur == 1) {
    	ans = min(ans, max(rl[lim] - rl[1], rl[k] - rl[cur2]));
    	return 1;
    }	

    return 0;
}

void solve() {                   
	scanf("%d %d", &n, &m);

    for (int i = 1; i <= n; ++i) {
    	for (int j = 1; j <= m; ++j) {
    		scanf("%d", &arr[i][j]);
    	}
    }

    compress();
    // fi -> max, se -> min

    ans = rl[k] - rl[1];

    for (int step = 0; step < 4; ++step) {    	
    	for (int i = 1; i <= n; ++i) {
    		pref[i][1] = mp(arr[i][1], arr[i][1]);
    		suff[i][m] = mp(arr[i][m], arr[i][m]);

    		for (int j = 2; j <= m; ++j) {              
    			pref[i][j].fi = max(pref[i][j - 1].fi, arr[i][j]);
    			pref[i][j].se = min(pref[i][j - 1].se, arr[i][j]);
    		}

    		for (int j = m - 1; j > 0; --j) {
    			suff[i][j].fi = max(suff[i][j + 1].fi, arr[i][j]);
    			suff[i][j].se = min(suff[i][j + 1].se, arr[i][j]);
    		}
    	}    	

    	{
    		int l = 2, r = k;

    		while (l <= r) {
    			int mid = (l + r) >> 1;

    			if (!goPrefL(mid)) {
    				r = mid - 1;
    			}
    			else {
    				l = mid + 1;
    			}
    		}
    	}

    	{
    		int l = 2, r = k;

    		while (l <= r) {
    			int mid = (l + r) >> 1;

    			if (!goSuffL(mid)) {
    				r = mid - 1;
    			}
    			else {
    				l = mid + 1;
    			}
    		}
    	}    	

    	{
    		int l = 1, r = k - 1;

    		while (l <= r) {
    			int mid = (l + r) >> 1;

    			if (!goPrefR(mid)) {
    				l = mid + 1;
    			}
    			else {
    				r = mid - 1;
    			}
    		}
    	}            	    	

    	for (int i = k - 1; i > 0; --i) {
    		if (!goSuffR(i)) {
    			break;
    		}
    	}
		
		// rotate array

		for (int i = 1; i <= n; ++i) {
			for (int j = 1; j <= m; ++j) {
				newArr[m - j + 1][i] = arr[i][j];
			}
		}

		swap(n, m);

		for (int i = 1; i <= n; ++i) {
			for (int j = 1; j <= m; ++j) {
				arr[i][j] = newArr[i][j];
			}
		}
    }

    printf("%d\n", ans);
}

int main() {    
    int tt = 1;

    while (tt--) {
        solve();
    }

    return 0;
}

Compilation message

joioi.cpp: In function 'void solve()':
joioi.cpp:162:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
joioi.cpp:166:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &arr[i][j]);
       ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 3 ms 504 KB Output is correct
3 Correct 3 ms 692 KB Output is correct
4 Correct 4 ms 768 KB Output is correct
5 Correct 3 ms 768 KB Output is correct
6 Correct 4 ms 768 KB Output is correct
7 Correct 3 ms 768 KB Output is correct
8 Correct 2 ms 768 KB Output is correct
9 Correct 2 ms 768 KB Output is correct
10 Correct 3 ms 768 KB Output is correct
11 Correct 3 ms 768 KB Output is correct
12 Correct 2 ms 768 KB Output is correct
13 Correct 3 ms 768 KB Output is correct
14 Correct 3 ms 768 KB Output is correct

Subtask #2
0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 3 ms 504 KB Output is correct
3 Correct 3 ms 692 KB Output is correct
4 Correct 4 ms 768 KB Output is correct
5 Correct 3 ms 768 KB Output is correct
6 Correct 4 ms 768 KB Output is correct
7 Correct 3 ms 768 KB Output is correct
8 Correct 2 ms 768 KB Output is correct
9 Correct 2 ms 768 KB Output is correct
10 Correct 3 ms 768 KB Output is correct
11 Correct 3 ms 768 KB Output is correct
12 Correct 2 ms 768 KB Output is correct
13 Correct 3 ms 768 KB Output is correct
14 Correct 3 ms 768 KB Output is correct
15 Correct 5 ms 3944 KB Output is correct
16 Correct 14 ms 4800 KB Output is correct
17 Correct 27 ms 5040 KB Output is correct
18 Correct 39 ms 5040 KB Output is correct
19 Correct 40 ms 5040 KB Output is correct
20 Correct 24 ms 5040 KB Output is correct
21 Correct 25 ms 5040 KB Output is correct
22 Correct 46 ms 5048 KB Output is correct
23 Incorrect 34 ms 5048 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 3 ms 504 KB Output is correct
3 Correct 3 ms 692 KB Output is correct
4 Correct 4 ms 768 KB Output is correct
5 Correct 3 ms 768 KB Output is correct
6 Correct 4 ms 768 KB Output is correct
7 Correct 3 ms 768 KB Output is correct
8 Correct 2 ms 768 KB Output is correct
9 Correct 2 ms 768 KB Output is correct
10 Correct 3 ms 768 KB Output is correct
11 Correct 3 ms 768 KB Output is correct
12 Correct 2 ms 768 KB Output is correct
13 Correct 3 ms 768 KB Output is correct
14 Correct 3 ms 768 KB Output is correct
15 Correct 5 ms 3944 KB Output is correct
16 Correct 14 ms 4800 KB Output is correct
17 Correct 27 ms 5040 KB Output is correct
18 Correct 39 ms 5040 KB Output is correct
19 Correct 40 ms 5040 KB Output is correct
20 Correct 24 ms 5040 KB Output is correct
21 Correct 25 ms 5040 KB Output is correct
22 Correct 46 ms 5048 KB Output is correct
23 Incorrect 34 ms 5048 KB Output isn't correct
24 Halted 0 ms 0 KB -