Submission #119238

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
119238	2019-06-20T17:25:56 Z	tmwilliamlin168	Bomb (IZhO17_bomb)	C++14	100 / 100	494 ms	62380 KB

bomb

#include <bits/stdc++.h>
using namespace std;

const int mxN=2500;
int n, m, mxw=mxN, mxh=mxN, u[mxN][mxN], d[mxN][mxN], a[mxN], ans;
string g[mxN];

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	cin >> n >> m;
	for(int i=0; i<n; ++i) {
		cin >> g[i];
		for(int j=0, w=0; j<m; ++j) {
			w=g[i][j]&1?w+1:0;
			if(w&&(j+1>=m||g[i][j+1]&1^1))
				mxw=min(w, mxw);
		}
	}
	for(int j=0; j<m; ++j) {
		for(int i=0, h=0; i<n; ++i) {
			h=g[i][j]&1?h+1:0;
			if(h&&(i+1>=n||g[i+1][j]&1^1))
				mxh=min(h, mxh);
			u[i][j]=i&&g[i-1][j]&1?u[i-1][j]:i;
		}
		for(int i=n-1; ~i; --i)
			d[i][j]=i<n-1&&g[i+1][j]&1?d[i+1][j]:i;
	}
	for(int i=0; i<mxw; ++i)
		a[i]=mxh;
	auto c=[]() {
		for(int i=0; i<n; ++i) {
			for(int j=0; j<m; ++j) {
				if(j&&g[i][j-1]&1||g[i][j]&1^1)
					continue;
				for(int k=0, l=0, r=n; k<mxw; ++k) {
					l=max(u[i][j+k], l);
					r=min(d[i][j+k], r);
					a[k]=min(r-l+1, a[k]);
				}
			}
		}
	};
	c();
	for(int i=0; i<n; ++i) {
		reverse(g[i].begin(), g[i].end());
		reverse(u[i], u[i]+m);
		reverse(d[i], d[i]+m);
	}
	c();
	for(int i=0; i<mxw; ++i)
		ans=max((i+1)*a[i], ans);
	cout << ans;
}

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:17:28: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
    if(w&&(j+1>=m||g[i][j+1]&1^1))
bomb.cpp:24:28: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
    if(h&&(i+1>=n||g[i+1][j]&1^1))
bomb.cpp: In lambda function:
bomb.cpp:36:31: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
     if(j&&g[i][j-1]&1||g[i][j]&1^1)
bomb.cpp:36:9: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(j&&g[i][j-1]&1||g[i][j]&1^1)
        ~^~~~~~~~~~~~~

Subtask #1

100.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	512 KB	Output is correct
2	Correct	2 ms	640 KB	Output is correct
3	Correct	17 ms	20608 KB	Output is correct
4	Correct	16 ms	20480 KB	Output is correct
5	Correct	2 ms	512 KB	Output is correct
6	Correct	2 ms	384 KB	Output is correct
7	Correct	2 ms	512 KB	Output is correct
8	Correct	2 ms	640 KB	Output is correct
9	Correct	2 ms	640 KB	Output is correct
10	Correct	2 ms	512 KB	Output is correct
11	Correct	3 ms	640 KB	Output is correct
12	Correct	2 ms	512 KB	Output is correct
13	Correct	2 ms	512 KB	Output is correct
14	Correct	2 ms	512 KB	Output is correct
15	Correct	2 ms	512 KB	Output is correct
16	Correct	2 ms	640 KB	Output is correct
17	Correct	3 ms	1024 KB	Output is correct
18	Correct	3 ms	1024 KB	Output is correct
19	Correct	3 ms	1280 KB	Output is correct
20	Correct	3 ms	1252 KB	Output is correct
21	Correct	3 ms	896 KB	Output is correct
22	Correct	3 ms	1152 KB	Output is correct
23	Correct	3 ms	1408 KB	Output is correct
24	Correct	3 ms	1152 KB	Output is correct
25	Correct	3 ms	1408 KB	Output is correct
26	Correct	3 ms	1280 KB	Output is correct
27	Correct	6 ms	3584 KB	Output is correct
28	Correct	6 ms	3840 KB	Output is correct
29	Correct	7 ms	4736 KB	Output is correct
30	Correct	9 ms	5732 KB	Output is correct
31	Correct	7 ms	4608 KB	Output is correct
32	Correct	7 ms	5248 KB	Output is correct
33	Correct	9 ms	6016 KB	Output is correct
34	Correct	6 ms	4096 KB	Output is correct
35	Correct	9 ms	6016 KB	Output is correct
36	Correct	11 ms	6016 KB	Output is correct
37	Correct	2 ms	640 KB	Output is correct
38	Correct	332 ms	62088 KB	Output is correct
39	Correct	2 ms	640 KB	Output is correct
40	Correct	32 ms	14976 KB	Output is correct
41	Correct	2 ms	640 KB	Output is correct
42	Correct	3 ms	1408 KB	Output is correct
43	Correct	317 ms	62132 KB	Output is correct
44	Correct	10 ms	5988 KB	Output is correct
45	Correct	326 ms	62072 KB	Output is correct
46	Correct	344 ms	62264 KB	Output is correct
47	Correct	329 ms	62204 KB	Output is correct
48	Correct	332 ms	62228 KB	Output is correct
49	Correct	327 ms	62132 KB	Output is correct
50	Correct	333 ms	62316 KB	Output is correct
51	Correct	329 ms	62200 KB	Output is correct
52	Correct	328 ms	62072 KB	Output is correct
53	Correct	323 ms	62176 KB	Output is correct
54	Correct	322 ms	62304 KB	Output is correct
55	Correct	333 ms	62204 KB	Output is correct
56	Correct	340 ms	62200 KB	Output is correct
57	Correct	321 ms	62200 KB	Output is correct
58	Correct	318 ms	62072 KB	Output is correct
59	Correct	311 ms	62200 KB	Output is correct
60	Correct	318 ms	62200 KB	Output is correct
61	Correct	317 ms	62072 KB	Output is correct
62	Correct	307 ms	62072 KB	Output is correct
63	Correct	325 ms	62164 KB	Output is correct
64	Correct	332 ms	62172 KB	Output is correct
65	Correct	324 ms	62300 KB	Output is correct
66	Correct	494 ms	62200 KB	Output is correct
67	Correct	338 ms	62236 KB	Output is correct
68	Correct	329 ms	62200 KB	Output is correct
69	Correct	323 ms	62172 KB	Output is correct
70	Correct	198 ms	47724 KB	Output is correct
71	Correct	325 ms	62200 KB	Output is correct
72	Correct	321 ms	62072 KB	Output is correct
73	Correct	342 ms	62200 KB	Output is correct
74	Correct	319 ms	62200 KB	Output is correct
75	Correct	328 ms	62312 KB	Output is correct
76	Correct	327 ms	62380 KB	Output is correct
77	Correct	314 ms	62200 KB	Output is correct
78	Correct	343 ms	62200 KB	Output is correct
79	Correct	306 ms	62072 KB	Output is correct
80	Correct	307 ms	62116 KB	Output is correct
81	Correct	308 ms	62180 KB	Output is correct
82	Correct	316 ms	62204 KB	Output is correct
83	Correct	314 ms	62204 KB	Output is correct
84	Correct	311 ms	62152 KB	Output is correct
85	Correct	308 ms	62072 KB	Output is correct
86	Correct	305 ms	62152 KB	Output is correct
87	Correct	307 ms	62072 KB	Output is correct
88	Correct	316 ms	62200 KB	Output is correct
89	Correct	298 ms	62072 KB	Output is correct
90	Correct	183 ms	47736 KB	Output is correct
91	Correct	310 ms	62176 KB	Output is correct
92	Correct	301 ms	62072 KB	Output is correct
93	Correct	312 ms	62156 KB	Output is correct
94	Correct	310 ms	62016 KB	Output is correct
95	Correct	318 ms	62200 KB	Output is correct
96	Correct	312 ms	62200 KB	Output is correct
97	Correct	306 ms	62072 KB	Output is correct
98	Correct	304 ms	62072 KB	Output is correct
99	Correct	300 ms	62176 KB	Output is correct
100	Correct	300 ms	62072 KB	Output is correct