oj.uz

Submission #68272

# Submission time Handle Problem Language Result Execution time Memory
68272 2018-08-16T10:51:08 Z BThero The Kingdom of JOIOI (JOI17_joioi) C++17
60 / 100
 4000 ms 95844 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 (!goPrefR(mid)) {
    				r = mid - 1;
    			}
    			else {
    				l = mid + 1;
    			}
    		}
    	}    	

    	for (int i = k - 1; i > 0; --i) {
    		if (!goPrefR(i)) {
				break;    		
    		}
    	}

    	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 588 KB Output is correct
3 Correct 4 ms 588 KB Output is correct
4 Correct 3 ms 640 KB Output is correct
5 Correct 2 ms 716 KB Output is correct
6 Correct 2 ms 716 KB Output is correct
7 Correct 3 ms 716 KB Output is correct
8 Correct 3 ms 828 KB Output is correct
9 Correct 3 ms 828 KB Output is correct
10 Correct 3 ms 828 KB Output is correct
11 Correct 3 ms 932 KB Output is correct
12 Correct 4 ms 932 KB Output is correct
13 Correct 2 ms 932 KB Output is correct
14 Correct 2 ms 932 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 3 ms 588 KB Output is correct
3 Correct 4 ms 588 KB Output is correct
4 Correct 3 ms 640 KB Output is correct
5 Correct 2 ms 716 KB Output is correct
6 Correct 2 ms 716 KB Output is correct
7 Correct 3 ms 716 KB Output is correct
8 Correct 3 ms 828 KB Output is correct
9 Correct 3 ms 828 KB Output is correct
10 Correct 3 ms 828 KB Output is correct
11 Correct 3 ms 932 KB Output is correct
12 Correct 4 ms 932 KB Output is correct
13 Correct 2 ms 932 KB Output is correct
14 Correct 2 ms 932 KB Output is correct
15 Correct 6 ms 3940 KB Output is correct
16 Correct 15 ms 4800 KB Output is correct
17 Correct 22 ms 4916 KB Output is correct
18 Correct 55 ms 4920 KB Output is correct
19 Correct 52 ms 5020 KB Output is correct
20 Correct 29 ms 5020 KB Output is correct
21 Correct 24 ms 5020 KB Output is correct
22 Correct 74 ms 5048 KB Output is correct
23 Correct 47 ms 5048 KB Output is correct
24 Correct 45 ms 5048 KB Output is correct
25 Correct 37 ms 5048 KB Output is correct
26 Correct 24 ms 5048 KB Output is correct
27 Correct 25 ms 5168 KB Output is correct
28 Correct 29 ms 5168 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 3 ms 588 KB Output is correct
3 Correct 4 ms 588 KB Output is correct
4 Correct 3 ms 640 KB Output is correct
5 Correct 2 ms 716 KB Output is correct
6 Correct 2 ms 716 KB Output is correct
7 Correct 3 ms 716 KB Output is correct
8 Correct 3 ms 828 KB Output is correct
9 Correct 3 ms 828 KB Output is correct
10 Correct 3 ms 828 KB Output is correct
11 Correct 3 ms 932 KB Output is correct
12 Correct 4 ms 932 KB Output is correct
13 Correct 2 ms 932 KB Output is correct
14 Correct 2 ms 932 KB Output is correct
15 Correct 6 ms 3940 KB Output is correct
16 Correct 15 ms 4800 KB Output is correct
17 Correct 22 ms 4916 KB Output is correct
18 Correct 55 ms 4920 KB Output is correct
19 Correct 52 ms 5020 KB Output is correct
20 Correct 29 ms 5020 KB Output is correct
21 Correct 24 ms 5020 KB Output is correct
22 Correct 74 ms 5048 KB Output is correct
23 Correct 47 ms 5048 KB Output is correct
24 Correct 45 ms 5048 KB Output is correct
25 Correct 37 ms 5048 KB Output is correct
26 Correct 24 ms 5048 KB Output is correct
27 Correct 25 ms 5168 KB Output is correct
28 Correct 29 ms 5168 KB Output is correct
29 Correct 3184 ms 95296 KB Output is correct
30 Execution timed out 4059 ms 95844 KB Time limit exceeded
31 Halted 0 ms 0 KB -