oj.uz

Submission #88111

# Submission time Handle Problem Language Result Execution time Memory
88111 2018-12-03T20:28:58 Z Pajaraja Bomb (IZhO17_bomb) C++17
34 / 100
 1000 ms 68276 KB 
#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
34.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 3 ms 756 KB Output is correct
3 Correct 48 ms 38856 KB Output is correct
4 Correct 50 ms 38916 KB Output is correct
5 Correct 2 ms 38916 KB Output is correct
6 Correct 2 ms 38916 KB Output is correct
7 Correct 2 ms 38916 KB Output is correct
8 Correct 3 ms 38916 KB Output is correct
9 Correct 3 ms 38916 KB Output is correct
10 Correct 2 ms 38916 KB Output is correct
11 Correct 3 ms 38916 KB Output is correct
12 Correct 2 ms 38916 KB Output is correct
13 Correct 2 ms 38916 KB Output is correct
14 Correct 3 ms 38916 KB Output is correct
15 Correct 3 ms 38916 KB Output is correct
16 Correct 3 ms 38916 KB Output is correct
17 Correct 4 ms 38916 KB Output is correct
18 Correct 4 ms 38916 KB Output is correct
19 Correct 6 ms 38916 KB Output is correct
20 Correct 6 ms 38916 KB Output is correct
21 Correct 4 ms 38916 KB Output is correct
22 Correct 4 ms 38916 KB Output is correct
23 Correct 9 ms 38916 KB Output is correct
24 Incorrect 5 ms 38916 KB Output isn't correct
25 Incorrect 10 ms 38916 KB Output isn't correct
26 Correct 8 ms 38916 KB Output is correct
27 Correct 6 ms 38916 KB Output is correct
28 Correct 23 ms 38916 KB Output is correct
29 Incorrect 115 ms 38916 KB Output isn't correct
30 Incorrect 152 ms 38916 KB Output isn't correct
31 Incorrect 132 ms 38916 KB Output isn't correct
32 Incorrect 114 ms 38916 KB Output isn't correct
33 Correct 227 ms 38916 KB Output is correct
34 Correct 25 ms 38916 KB Output is correct
35 Correct 118 ms 38916 KB Output is correct
36 Correct 173 ms 38916 KB Output is correct
37 Incorrect 3 ms 38916 KB Output isn't correct
38 Execution timed out 1092 ms 65112 KB Time limit exceeded
39 Incorrect 3 ms 65112 KB Output isn't correct
40 Execution timed out 1088 ms 65112 KB Time limit exceeded
41 Correct 3 ms 65112 KB Output is correct
42 Correct 10 ms 65112 KB Output is correct
43 Execution timed out 1082 ms 67444 KB Time limit exceeded
44 Correct 257 ms 67444 KB Output is correct
45 Execution timed out 1073 ms 67444 KB Time limit exceeded
46 Execution timed out 1082 ms 67964 KB Time limit exceeded
47 Execution timed out 1087 ms 67964 KB Time limit exceeded
48 Execution timed out 1068 ms 67972 KB Time limit exceeded
49 Correct 718 ms 68092 KB Output is correct
50 Execution timed out 1069 ms 68092 KB Time limit exceeded
51 Execution timed out 1075 ms 68092 KB Time limit exceeded
52 Execution timed out 1083 ms 68092 KB Time limit exceeded
53 Execution timed out 1084 ms 68092 KB Time limit exceeded
54 Execution timed out 1071 ms 68092 KB Time limit exceeded
55 Execution timed out 1064 ms 68092 KB Time limit exceeded
56 Execution timed out 1075 ms 68092 KB Time limit exceeded
57 Execution timed out 1073 ms 68092 KB Time limit exceeded
58 Execution timed out 1078 ms 68092 KB Time limit exceeded
59 Execution timed out 1074 ms 68092 KB Time limit exceeded
60 Execution timed out 1084 ms 68092 KB Time limit exceeded
61 Execution timed out 1079 ms 68120 KB Time limit exceeded
62 Execution timed out 1071 ms 68120 KB Time limit exceeded
63 Execution timed out 1077 ms 68120 KB Time limit exceeded
64 Execution timed out 1088 ms 68120 KB Time limit exceeded
65 Execution timed out 1086 ms 68120 KB Time limit exceeded
66 Execution timed out 1079 ms 68120 KB Time limit exceeded
67 Execution timed out 1083 ms 68120 KB Time limit exceeded
68 Execution timed out 1082 ms 68120 KB Time limit exceeded
69 Execution timed out 1087 ms 68120 KB Time limit exceeded
70 Execution timed out 1078 ms 68120 KB Time limit exceeded
71 Execution timed out 1081 ms 68120 KB Time limit exceeded
72 Execution timed out 1074 ms 68120 KB Time limit exceeded
73 Execution timed out 1075 ms 68148 KB Time limit exceeded
74 Execution timed out 1078 ms 68148 KB Time limit exceeded
75 Execution timed out 1077 ms 68276 KB Time limit exceeded
76 Execution timed out 1092 ms 68276 KB Time limit exceeded
77 Execution timed out 1087 ms 68276 KB Time limit exceeded
78 Execution timed out 1072 ms 68276 KB Time limit exceeded
79 Execution timed out 1077 ms 68276 KB Time limit exceeded
80 Execution timed out 1074 ms 68276 KB Time limit exceeded
81 Execution timed out 1076 ms 68276 KB Time limit exceeded
82 Execution timed out 1085 ms 68276 KB Time limit exceeded
83 Execution timed out 1085 ms 68276 KB Time limit exceeded
84 Execution timed out 1077 ms 68276 KB Time limit exceeded
85 Execution timed out 1066 ms 68276 KB Time limit exceeded
86 Execution timed out 1088 ms 68276 KB Time limit exceeded
87 Execution timed out 1082 ms 68276 KB Time limit exceeded
88 Execution timed out 1080 ms 68276 KB Time limit exceeded
89 Execution timed out 1057 ms 68276 KB Time limit exceeded
90 Execution timed out 1085 ms 68276 KB Time limit exceeded
91 Execution timed out 1086 ms 68276 KB Time limit exceeded
92 Execution timed out 1079 ms 68276 KB Time limit exceeded
93 Execution timed out 1068 ms 68276 KB Time limit exceeded
94 Execution timed out 1091 ms 68276 KB Time limit exceeded
95 Execution timed out 1090 ms 68276 KB Time limit exceeded
96 Execution timed out 1089 ms 68276 KB Time limit exceeded
97 Execution timed out 1085 ms 68276 KB Time limit exceeded
98 Execution timed out 1093 ms 68276 KB Time limit exceeded
99 Execution timed out 1094 ms 68276 KB Time limit exceeded
100 Execution timed out 1077 ms 68276 KB Time limit exceeded