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Submission #388284

# Submission time Handle Problem Language Result Execution time Memory
388284 2021-04-10T18:56:18 Z patrikpavic2 Bomb (IZhO17_bomb) C++17
70 / 100
 635 ms 90316 KB 
#include <cstdio>
#include <algorithm>
#include <vector>
#include <cstring>

#define PB push_back

using namespace std;

const int N = 2505;

int n, m;
char s[N][N];
int A[N][N], B[N][N];

int par[N], L[N], R[N], un[N], nula[N];
int S[N];

int pr(int x){
	if(x == par[x]) return x;
	return par[x] = pr(par[x]);
}

void mrg(int x, int y){
	if(x < 0 || y >= m || !un[x] || !un[y]) return;
//	printf("mrg %d %d\n", x, y);
	x = pr(x), y = pr(y);
	if(x == y) return;
	if(nula[x]) S[R[x] - L[x] + 1]--; 
	if(nula[y]) S[R[y] - L[y] + 1]--;
	if(R[x] - L[x] > R[y] - L[y]){
		par[y] = x; R[x] = R[y];
		nula[x] |= nula[y];
		if(nula[x])
			S[R[x] - L[x] + 1]++;
	}
	else{
		par[x] = y; L[y] = L[x];
		nula[y] |= nula[x];
		if(nula[y])
			S[R[y] - L[y] + 1]++;
	}
}

vector < int > kon[N];
int ans[N];

void odradi_redak(int rd){
	for(int i = 0;i <= m;i++) S[i] = 0;
	for(int i = 0;i <= n;i++) kon[i].clear();
	for(int i = 0;i < m;i++){
		un[i] = 0; 
		if(s[rd][i] == '0') continue;
		par[i] = i; nula[i] = (B[rd][i] == 1);
		L[i] = i, R[i] = i;
		kon[A[rd][i]].PB(i);
		if(nula[i]) S[0]++;
	}
	if(!S[0]) return;
	int cur = 0;
	for(int i = n;i >= 1;i--){
		for(int x : kon[i]){
			if(nula[x])
				S[0]--, S[1]++;
		//	printf("x = %d nula = %d\n", x, nula[x]);
			un[x] = 1;
			mrg(x - 1, x);
			mrg(x, x + 1);
		}
		while(!S[cur]) cur++;
		//printf("rd = %d i = %d cur = %d\n", rd, i, cur);
		ans[i] = min(ans[i], cur);
	}
}

int main(){
	//freopen("bomb.in", "r", stdin);
	//freopen("bomb.out", "w", stdout);
	scanf("%d%d", &n, &m);
	int fin = n * m;
	for(int i = 0;i < n;i++)
		for(int j = 0;j < m;j++)
			scanf(" %c", &s[i][j]);
	for(int bla = 0;bla < 2;bla++){
		memset(A, 0, sizeof(A));
		memset(B, 0, sizeof(B));
		for(int i = 0;i < n;i++)
			for(int j = 0;j < m;j++)
				A[i][j] = (1 + (i ? A[i - 1][j] : 0)) * (s[i][j] - '0');
		for(int i = n - 1;i >= 0;i--)
			for(int j = 0;j < m;j++)
				B[i][j] = (1 + B[i + 1][j]) * (s[i][j] - '0');
		for(int i = 1;i <= n;i++) ans[i] = m;
		for(int i = 0;i < n;i++) odradi_redak(i);
		int sol = 1;
		for(int i = 1;i <= n;i++){
			sol = max(sol, ans[i] * i);
			//printf("ans[ %d ] = %d\n", i, ans[i]);
		}
		fin = min(fin, sol);
		for(int i = 0;n - i - 1 > i;i++){
			for(int j = 0;j < m;j++)
				swap(s[i][j], s[n - i - 1][j]);
		}
	}
	printf("%d\n", fin);
	return 0;
}

/*
5 6
000000
111110
111110
111110
001000

*/

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:79:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   79 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
bomb.cpp:83:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   83 |    scanf(" %c", &s[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
70.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 49392 KB Output is correct
2 Correct 27 ms 49428 KB Output is correct
3 Correct 43 ms 55628 KB Output is correct
4 Correct 43 ms 55616 KB Output is correct
5 Correct 27 ms 49488 KB Output is correct
6 Correct 27 ms 49508 KB Output is correct
7 Incorrect 27 ms 49456 KB Output isn't correct
8 Correct 27 ms 49504 KB Output is correct
9 Incorrect 27 ms 49524 KB Output isn't correct
10 Correct 27 ms 49516 KB Output is correct
11 Correct 28 ms 49412 KB Output is correct
12 Correct 26 ms 49488 KB Output is correct
13 Correct 27 ms 49524 KB Output is correct
14 Correct 28 ms 49420 KB Output is correct
15 Correct 27 ms 49428 KB Output is correct
16 Correct 28 ms 49456 KB Output is correct
17 Correct 28 ms 49604 KB Output is correct
18 Correct 28 ms 49664 KB Output is correct
19 Incorrect 28 ms 49692 KB Output isn't correct
20 Correct 28 ms 49716 KB Output is correct
21 Correct 29 ms 49612 KB Output is correct
22 Correct 29 ms 49680 KB Output is correct
23 Incorrect 29 ms 49740 KB Output isn't correct
24 Incorrect 29 ms 49692 KB Output isn't correct
25 Correct 28 ms 49740 KB Output is correct
26 Incorrect 29 ms 49740 KB Output isn't correct
27 Incorrect 38 ms 50460 KB Output isn't correct
28 Correct 41 ms 50200 KB Output is correct
29 Correct 41 ms 50652 KB Output is correct
30 Incorrect 50 ms 50628 KB Output isn't correct
31 Correct 39 ms 50324 KB Output is correct
32 Incorrect 47 ms 50492 KB Output isn't correct
33 Correct 47 ms 50736 KB Output is correct
34 Correct 34 ms 50288 KB Output is correct
35 Incorrect 43 ms 50500 KB Output isn't correct
36 Incorrect 47 ms 51440 KB Output isn't correct
37 Correct 28 ms 49452 KB Output is correct
38 Correct 597 ms 90316 KB Output is correct
39 Correct 28 ms 49484 KB Output is correct
40 Correct 99 ms 54092 KB Output is correct
41 Correct 27 ms 49544 KB Output is correct
42 Correct 29 ms 49752 KB Output is correct
43 Correct 635 ms 60692 KB Output is correct
44 Correct 47 ms 50972 KB Output is correct
45 Correct 592 ms 70128 KB Output is correct
46 Correct 532 ms 55844 KB Output is correct
47 Correct 587 ms 70344 KB Output is correct
48 Correct 631 ms 65872 KB Output is correct
49 Incorrect 629 ms 89440 KB Output isn't correct
50 Correct 587 ms 66988 KB Output is correct
51 Correct 576 ms 66648 KB Output is correct
52 Correct 576 ms 66280 KB Output is correct
53 Correct 606 ms 65732 KB Output is correct
54 Correct 544 ms 65680 KB Output is correct
55 Correct 566 ms 65720 KB Output is correct
56 Correct 600 ms 89772 KB Output is correct
57 Correct 558 ms 65956 KB Output is correct
58 Correct 530 ms 66240 KB Output is correct
59 Correct 520 ms 65732 KB Output is correct
60 Correct 633 ms 72996 KB Output is correct
61 Incorrect 612 ms 89548 KB Output isn't correct
62 Incorrect 601 ms 85996 KB Output isn't correct
63 Incorrect 602 ms 90248 KB Output isn't correct
64 Correct 516 ms 63620 KB Output is correct
65 Correct 565 ms 65732 KB Output is correct
66 Correct 604 ms 66116 KB Output is correct
67 Correct 590 ms 68168 KB Output is correct
68 Correct 607 ms 70716 KB Output is correct
69 Correct 514 ms 66092 KB Output is correct
70 Incorrect 326 ms 55400 KB Output isn't correct
71 Incorrect 502 ms 58264 KB Output isn't correct
72 Correct 513 ms 58876 KB Output is correct
73 Correct 533 ms 58508 KB Output is correct
74 Incorrect 510 ms 58528 KB Output isn't correct
75 Incorrect 520 ms 59980 KB Output isn't correct
76 Correct 539 ms 58980 KB Output is correct
77 Correct 505 ms 59616 KB Output is correct
78 Correct 523 ms 59052 KB Output is correct
79 Incorrect 481 ms 55752 KB Output isn't correct
80 Incorrect 495 ms 55660 KB Output isn't correct
81 Incorrect 528 ms 56168 KB Output isn't correct
82 Correct 557 ms 59804 KB Output is correct
83 Incorrect 546 ms 58976 KB Output isn't correct
84 Incorrect 508 ms 55648 KB Output isn't correct
85 Incorrect 533 ms 59904 KB Output isn't correct
86 Incorrect 593 ms 86980 KB Output isn't correct
87 Correct 554 ms 61200 KB Output is correct
88 Correct 558 ms 59376 KB Output is correct
89 Correct 575 ms 69908 KB Output is correct
90 Incorrect 350 ms 57108 KB Output isn't correct
91 Correct 547 ms 65920 KB Output is correct
92 Correct 538 ms 67244 KB Output is correct
93 Correct 589 ms 86200 KB Output is correct
94 Correct 553 ms 69060 KB Output is correct
95 Incorrect 545 ms 59468 KB Output isn't correct
96 Correct 512 ms 59004 KB Output is correct
97 Correct 594 ms 87024 KB Output is correct
98 Correct 516 ms 60640 KB Output is correct
99 Incorrect 537 ms 68676 KB Output isn't correct
100 Incorrect 583 ms 85584 KB Output isn't correct