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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ms(s,n) memset(s,n,sizeof(s))
  5. #define all(a) a.begin(),a.end()
  6. #define present(t, x) (t.find(x) != t.end())
  7. #define sz(a) int((a).size())
  8. #define FOR(i, a, b) for (int i = (a); i < (b); ++i)
  9. #define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
  10. #define pb push_back
  11. #define pf push_front
  12. #define fi first
  13. #define se second
  14. #define mp make_pair
  15. #define endl "\n"
  16.  
  17.  
  18. typedef long long ll;
  19. typedef unsigned long long ull;
  20. typedef long double ld;
  21. typedef pair<int,int> pi;
  22. typedef vector<int> vi;
  23. typedef vector<pi> vii;
  24.  
  25. const int MOD = (int) 1e9+7;
  26. const int INF = (int) 1e9+2804;
  27. inline ll gcd(ll a,ll b){ll r;while(b){r=a%b;a=b;b=r;}return a;}
  28. inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
  29.  
  30. int n, m, a[505][505];
  31.  
  32. int max_area(int x[]){
  33. 	int res = 0;
  34. 	int i = 0;
  35. 	stack<int> st;
  36. 	while(i < m){
  37. 		if(st.empty() || x[i] >= x[st.top()]) st.push(i++);
  38. 		else{
  39. 			int top = st.top(); st.pop();
  40. 			if(st.empty()){
  41. 				res = max(res, i * x[top]);
  42. 			}
  43. 			else{
  44. 				res = max(res, x[top]* (i - st.top() - 1));
  45. 			}
  46. 		}
  47. 	}
  48. 	while(!st.empty()){
  49. 		int top = st.top(); st.pop();
  50. 		if(st.empty()){
  51. 			res = max(res, i * x[top]);
  52. 		}
  53. 		else{
  54. 			res = max(res, x[top] * (i - st.top() - 1));
  55. 		}
  56. 	}
  57. 	return res;
  58. }
  59.  
  60.  
  61. void solve(){
  62. 	cin >> n >> m;
  63. 	for(int i = 0; i < n; i++){
  64. 		for(int j = 0; j < m; j++) cin >> a[i][j];
  65. 	}
  66. 	int tmp[n][m];
  67. 	for(int i = 0; i < n; i++){
  68. 		for(int j = 0; j < m; j++){
  69. 			if(i == 0) tmp[i][j] = a[i][j];
  70. 			else if(a[i][j]){
  71. 				tmp[i][j] = tmp[i - 1][j] + 1;
  72. 			}
  73. 			else tmp[i][j] = 0;
  74. 		}
  75. 	}
  76. 	int ans = 0;
  77. 	for(int i = 0; i < n; i++){
  78. 		ans = max(ans, max_area(tmp[i]));
  79. 	}
  80. 	cout << ans << endl;
  81. }
  82.  
  83.  
  84. int main(){
  85. 	ios::sync_with_stdio(false);
  86. 	cin.tie(nullptr);
  87. 	int TC; cin >> TC;
  88. 	while(TC--){
  89. 		solve();
  90. 	}
  91. 	return 0;
  92. }
  93.  
  94.  
  95.  
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/5P2yaD
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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