답안 #88112

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
88112	2018-12-03T20:31:10 Z	Pajaraja	Bomb (IZhO17_bomb)	C++17	40 / 100	1000 ms	68436 KB

bomb

#include <bits/stdc++.h>
#define MAXN 2507
using namespace std;
bool t[MAXN][MAXN],r[MAXN][MAXN];
int p[MAXN][MAXN],d[MAXN][MAXN],n,m,lh,lv;
char s[MAXN][MAXN];
bool provera(int x,int y)
{
	for(int i=x;i<=n;i++) for(int j=y;j<=m;j++) r[i][j]=(p[i][j]-p[i-x][j]-p[i][j-y]+p[i-x][j-y]==x*y);
	for(int i=n;i>0;i--) for(int j=m;j>0;j--) d[i][j]=r[i][j]+d[i+1][j]+d[i][j+1]-d[i+1][j+1];
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) if(t[i][j] && d[i][j]-d[min(n+1,i+x)][j]-d[i][min(m+1,j+y)]+d[min(n+1,i+x)][min(m+1,j+y)]==0) return false;
	return true;
}
int binarna(int l,int r,int x)
{
	if(l==r) return l;
	int s=(l+r+1)/2;
	if(provera(s,x)) return binarna(s,r,x);
	return binarna(l,s-1,x);
}
int najres(int x) {return x*binarna(1,lv,x);}
int main()
{
	lh=lv=MAXN;
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++)
	{
		scanf("%s",s[i]);
		for(int j=1;j<=m;j++) t[i][j]=(s[i][j-1]=='1'?1:0);
	}
	for(int i=1;i<=n;i++)
	{
		int cur=0;
		for(int j=1;j<=m;j++)
		{
			if(t[i][j]==0) {if(cur!=0) lh=min(lh,cur); cur=0;}
			else cur++;
		}
		if(cur!=0) lh=min(lh,cur);
	}
	for(int i=1;i<=m;i++)
	{
		int cur=0;
		for(int j=1;j<=n;j++)
		{
			if(t[j][i]==0) {if(cur!=0) lv=min(lv,cur); cur=0;}
			else cur++;
		}
		if(cur!=0) lv=min(lv,cur);
	}
	int sol=0;
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) p[i][j]=t[i][j]+p[i-1][j]+p[i][j-1]-p[i-1][j-1];
	int l=1,r=lh;
	/*while(r-l>3)
	{
		int s1=(2*l+r)/3,s2=(l+2*r)/3;
		if(najres(s1)<najres(s2)) l=s1;
		else r=s2;
	}*/
	for(int i=l;i<=r;i++) sol=max(sol,najres(i));
	/*for(int i=1;i<=lv;i++)
	{
		while(!provera(i,lh)) lh--; 
		if(sol>lh*lv) break;
		sol=max(sol,lh*i);
	}*/
	printf("%d",sol);
}

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
bomb.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s",s[i]);
   ~~~~~^~~~~~~~~~~

Subtask #1

40.0 / 100.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	764 KB	Output is correct
3	Correct	44 ms	38840 KB	Output is correct
4	Correct	44 ms	38876 KB	Output is correct
5	Correct	2 ms	38876 KB	Output is correct
6	Correct	2 ms	38876 KB	Output is correct
7	Correct	2 ms	38876 KB	Output is correct
8	Correct	2 ms	38876 KB	Output is correct
9	Correct	2 ms	38876 KB	Output is correct
10	Correct	2 ms	38876 KB	Output is correct
11	Correct	2 ms	38876 KB	Output is correct
12	Correct	2 ms	38876 KB	Output is correct
13	Correct	2 ms	38876 KB	Output is correct
14	Correct	3 ms	38876 KB	Output is correct
15	Correct	3 ms	38876 KB	Output is correct
16	Correct	3 ms	38876 KB	Output is correct
17	Correct	4 ms	38876 KB	Output is correct
18	Correct	3 ms	38876 KB	Output is correct
19	Correct	7 ms	38876 KB	Output is correct
20	Correct	7 ms	38876 KB	Output is correct
21	Correct	3 ms	38876 KB	Output is correct
22	Correct	4 ms	38876 KB	Output is correct
23	Correct	11 ms	38876 KB	Output is correct
24	Correct	6 ms	38876 KB	Output is correct
25	Correct	13 ms	38876 KB	Output is correct
26	Correct	7 ms	38876 KB	Output is correct
27	Correct	6 ms	38876 KB	Output is correct
28	Correct	23 ms	38876 KB	Output is correct
29	Correct	474 ms	38876 KB	Output is correct
30	Correct	850 ms	38876 KB	Output is correct
31	Correct	528 ms	38876 KB	Output is correct
32	Correct	326 ms	38876 KB	Output is correct
33	Execution timed out	1070 ms	38876 KB	Time limit exceeded
34	Correct	26 ms	38876 KB	Output is correct
35	Correct	611 ms	38876 KB	Output is correct
36	Correct	247 ms	38876 KB	Output is correct
37	Correct	3 ms	38876 KB	Output is correct
38	Execution timed out	1088 ms	65020 KB	Time limit exceeded
39	Correct	3 ms	65020 KB	Output is correct
40	Execution timed out	1080 ms	65020 KB	Time limit exceeded
41	Correct	3 ms	65020 KB	Output is correct
42	Correct	20 ms	65020 KB	Output is correct
43	Execution timed out	1064 ms	67516 KB	Time limit exceeded
44	Execution timed out	1076 ms	67516 KB	Time limit exceeded
45	Execution timed out	1084 ms	67516 KB	Time limit exceeded
46	Execution timed out	1086 ms	67964 KB	Time limit exceeded
47	Execution timed out	1077 ms	67964 KB	Time limit exceeded
48	Execution timed out	1066 ms	68092 KB	Time limit exceeded
49	Correct	694 ms	68220 KB	Output is correct
50	Execution timed out	1077 ms	68220 KB	Time limit exceeded
51	Execution timed out	1089 ms	68220 KB	Time limit exceeded
52	Execution timed out	1088 ms	68220 KB	Time limit exceeded
53	Execution timed out	1084 ms	68220 KB	Time limit exceeded
54	Execution timed out	1080 ms	68220 KB	Time limit exceeded
55	Execution timed out	1089 ms	68220 KB	Time limit exceeded
56	Execution timed out	1082 ms	68220 KB	Time limit exceeded
57	Execution timed out	1092 ms	68220 KB	Time limit exceeded
58	Execution timed out	1076 ms	68220 KB	Time limit exceeded
59	Execution timed out	1079 ms	68220 KB	Time limit exceeded
60	Execution timed out	1082 ms	68220 KB	Time limit exceeded
61	Execution timed out	1090 ms	68220 KB	Time limit exceeded
62	Execution timed out	1095 ms	68220 KB	Time limit exceeded
63	Execution timed out	1075 ms	68220 KB	Time limit exceeded
64	Execution timed out	1088 ms	68220 KB	Time limit exceeded
65	Execution timed out	1086 ms	68220 KB	Time limit exceeded
66	Execution timed out	1086 ms	68220 KB	Time limit exceeded
67	Execution timed out	1078 ms	68220 KB	Time limit exceeded
68	Execution timed out	1073 ms	68220 KB	Time limit exceeded
69	Execution timed out	1080 ms	68220 KB	Time limit exceeded
70	Execution timed out	1083 ms	68220 KB	Time limit exceeded
71	Execution timed out	1072 ms	68220 KB	Time limit exceeded
72	Execution timed out	1066 ms	68220 KB	Time limit exceeded
73	Execution timed out	1065 ms	68220 KB	Time limit exceeded
74	Execution timed out	1081 ms	68220 KB	Time limit exceeded
75	Execution timed out	1061 ms	68220 KB	Time limit exceeded
76	Execution timed out	1093 ms	68220 KB	Time limit exceeded
77	Execution timed out	1079 ms	68220 KB	Time limit exceeded
78	Execution timed out	1070 ms	68220 KB	Time limit exceeded
79	Execution timed out	1086 ms	68220 KB	Time limit exceeded
80	Execution timed out	1072 ms	68220 KB	Time limit exceeded
81	Execution timed out	1087 ms	68220 KB	Time limit exceeded
82	Execution timed out	1085 ms	68220 KB	Time limit exceeded
83	Execution timed out	1073 ms	68220 KB	Time limit exceeded
84	Execution timed out	1062 ms	68220 KB	Time limit exceeded
85	Execution timed out	1062 ms	68220 KB	Time limit exceeded
86	Execution timed out	1093 ms	68220 KB	Time limit exceeded
87	Execution timed out	1077 ms	68220 KB	Time limit exceeded
88	Execution timed out	1073 ms	68220 KB	Time limit exceeded
89	Execution timed out	1054 ms	68220 KB	Time limit exceeded
90	Execution timed out	1075 ms	68220 KB	Time limit exceeded
91	Execution timed out	1085 ms	68220 KB	Time limit exceeded
92	Execution timed out	1081 ms	68220 KB	Time limit exceeded
93	Execution timed out	1078 ms	68304 KB	Time limit exceeded
94	Execution timed out	1056 ms	68304 KB	Time limit exceeded
95	Execution timed out	1082 ms	68304 KB	Time limit exceeded
96	Execution timed out	1084 ms	68304 KB	Time limit exceeded
97	Execution timed out	1066 ms	68436 KB	Time limit exceeded
98	Execution timed out	1072 ms	68436 KB	Time limit exceeded
99	Execution timed out	1082 ms	68436 KB	Time limit exceeded
100	Execution timed out	1066 ms	68436 KB	Time limit exceeded