oj.uz

Submission #833244

# Submission time Handle Problem Language Result Execution time Memory
833244 2023-08-22T03:38:43 Z vjudge1 Bomb (IZhO17_bomb) C++14
90 / 100
 532 ms 55560 KB 
#include<bits/stdc++.h>

#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;

#define ll long long
#define rep(i,n,N) for(int i = n; i<=N; ++i)
#define rap(i,n,N) for(int i = n; i>=N; --i)
#define For(i,n,N) for(int i = n; i< N; ++i)
#define endl '\n'
#define pb push_back
#define all(x) x.begin(),x.end()
#define mems(x,y) memset(x,y,sizeof x)
#define ari(x) array<int,x>
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fi first
#define se second
const int MAX = 2500 + 5;
mt19937 rng(time(NULL));

int n,m,mnr,mnc,cnt,y[MAX][MAX],z[MAX][MAX],ans;
char c;
bool x[MAX][MAX];
vector<ari(3)> v;

inline bool cek(int r,int c,int dr,int dc){
	return y[r][c] - y[r-dr][c] - y[r][c-dc] + y[r-dr][c-dc] == dr*dc;
}

inline bool solve(int dr,int dc){
	rep(i,1,n)mems(z[i], 0);
	rep(i,dr,n)rep(j,dc,m)if(x[i][j] && cek(i,j,dr,dc)){
		z[i][j]++;
		z[i-dr][j]--;
		z[i][j-dc]--;
		z[i-dr][j-dc]++;
	}
	rap(i,n,1)rap(j,m,1){
		z[i][j]+= z[i+1][j]+z[i][j+1]-z[i+1][j+1];
		if((!!z[i][j])!=x[i][j])return 0;
	}
	return 1;
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin>>n>>m;
	mnr = n, mnc = m;
	rep(i,1,n){
		rep(j,1,m){
			cin>>c;
			x[i][j] = c=='1';
			y[i][j] = y[i-1][j]+y[i][j-1]-y[i-1][j-1]+x[i][j];
		}
	}
	int k = min(mnr, mnc);
	int le,ri,mid;
	le = 1, ri = k;
	while(le<=ri){
		mid = le+ri>>1;
		if(solve(mid, mid))k = mid, le = mid+1;
		else ri = mid-1;
	}
	int r,c;
	r = c = k;
	if(r+1<=mnr && solve(r+1, c)){
		++r;
		le = r+1, ri = mnr;
		while(le<=ri){
			mid = le+ri>>1;
			if(solve(mid, c))r = mid, le = mid+1;
			else ri = mid-1;
		}
	}
	else if(c+1<=mnc){
		le = c+1, ri = mnc;
		while(le<=ri){
			mid = le+ri>>1;
			if(solve(r, mid))c = mid, le = mid+1;
			else ri = mid-1;
		}
	}
	cout<<r*c<<endl;
	return 0;
}

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:62:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   62 |   mid = le+ri>>1;
      |         ~~^~~
bomb.cpp:72:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   72 |    mid = le+ri>>1;
      |          ~~^~~
bomb.cpp:80:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   80 |    mid = le+ri>>1;
      |          ~~^~~

Subtask #1
90.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 41 ms 40916 KB Output is correct
4 Correct 43 ms 41012 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 0 ms 596 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 0 ms 468 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 0 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 1364 KB Output is correct
18 Correct 1 ms 1616 KB Output is correct
19 Correct 1 ms 1876 KB Output is correct
20 Correct 1 ms 1876 KB Output is correct
21 Correct 1 ms 1236 KB Output is correct
22 Correct 1 ms 1492 KB Output is correct
23 Correct 1 ms 2004 KB Output is correct
24 Correct 1 ms 1620 KB Output is correct
25 Correct 1 ms 2004 KB Output is correct
26 Correct 1 ms 2004 KB Output is correct
27 Correct 6 ms 5460 KB Output is correct
28 Correct 7 ms 5460 KB Output is correct
29 Incorrect 10 ms 7124 KB Output isn't correct
30 Correct 13 ms 8020 KB Output is correct
31 Correct 9 ms 6356 KB Output is correct
32 Correct 10 ms 7508 KB Output is correct
33 Correct 13 ms 8404 KB Output is correct
34 Correct 7 ms 6356 KB Output is correct
35 Correct 14 ms 8404 KB Output is correct
36 Correct 14 ms 8404 KB Output is correct
37 Incorrect 1 ms 596 KB Output isn't correct
38 Correct 186 ms 55480 KB Output is correct
39 Incorrect 1 ms 596 KB Output isn't correct
40 Incorrect 45 ms 17492 KB Output isn't correct
41 Incorrect 1 ms 596 KB Output isn't correct
42 Incorrect 2 ms 2004 KB Output isn't correct
43 Correct 346 ms 55476 KB Output is correct
44 Incorrect 12 ms 8404 KB Output isn't correct
45 Incorrect 306 ms 55476 KB Output isn't correct
46 Correct 276 ms 55512 KB Output is correct
47 Incorrect 372 ms 55476 KB Output isn't correct
48 Correct 342 ms 55476 KB Output is correct
49 Correct 369 ms 55560 KB Output is correct
50 Correct 363 ms 55480 KB Output is correct
51 Correct 356 ms 55476 KB Output is correct
52 Correct 389 ms 55476 KB Output is correct
53 Correct 415 ms 55500 KB Output is correct
54 Correct 325 ms 55376 KB Output is correct
55 Correct 340 ms 55372 KB Output is correct
56 Correct 309 ms 55500 KB Output is correct
57 Correct 336 ms 55472 KB Output is correct
58 Correct 310 ms 55544 KB Output is correct
59 Correct 352 ms 55476 KB Output is correct
60 Correct 393 ms 55436 KB Output is correct
61 Correct 360 ms 55476 KB Output is correct
62 Correct 437 ms 55356 KB Output is correct
63 Correct 307 ms 55420 KB Output is correct
64 Correct 282 ms 55476 KB Output is correct
65 Correct 367 ms 55480 KB Output is correct
66 Correct 308 ms 55372 KB Output is correct
67 Correct 435 ms 55480 KB Output is correct
68 Correct 381 ms 55372 KB Output is correct
69 Correct 363 ms 55372 KB Output is correct
70 Correct 253 ms 44460 KB Output is correct
71 Correct 346 ms 55468 KB Output is correct
72 Correct 351 ms 55372 KB Output is correct
73 Correct 372 ms 55476 KB Output is correct
74 Correct 422 ms 55476 KB Output is correct
75 Correct 368 ms 55372 KB Output is correct
76 Correct 391 ms 55476 KB Output is correct
77 Correct 403 ms 55476 KB Output is correct
78 Correct 434 ms 55472 KB Output is correct
79 Correct 340 ms 55472 KB Output is correct
80 Correct 355 ms 55476 KB Output is correct
81 Correct 409 ms 55468 KB Output is correct
82 Correct 376 ms 55476 KB Output is correct
83 Correct 389 ms 55480 KB Output is correct
84 Correct 374 ms 55468 KB Output is correct
85 Correct 380 ms 55500 KB Output is correct
86 Correct 485 ms 55476 KB Output is correct
87 Incorrect 426 ms 55468 KB Output isn't correct
88 Correct 369 ms 55476 KB Output is correct
89 Correct 448 ms 55468 KB Output is correct
90 Correct 266 ms 44584 KB Output is correct
91 Correct 432 ms 55468 KB Output is correct
92 Correct 479 ms 55468 KB Output is correct
93 Correct 478 ms 55468 KB Output is correct
94 Correct 470 ms 55472 KB Output is correct
95 Correct 375 ms 55472 KB Output is correct
96 Correct 369 ms 55412 KB Output is correct
97 Correct 532 ms 55472 KB Output is correct
98 Correct 429 ms 55476 KB Output is correct
99 Correct 527 ms 55476 KB Output is correct
100 Correct 493 ms 55468 KB Output is correct