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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. inline int power(int a, int b) {
  6.     int x = 1;
  7.     while (b) {
  8.         if (b & 1) x *= a;
  9.         a *= a;
  10.         b >>= 1;
  11.     }
  12.     return x;
  13. }
  14.  
  15.  
  16. const int M = 1000000007;
  17. const int N = 3e5+9;
  18. const int INF = 2e9+1;
  19. const int LINF = 2000000000000000001;
  20.  
  21. //_ ***************************** START Below *******************************
  22.  
  23.  
  24.  
  25. vector<int> a;
  26. void consistency(int n, int k) {
  27.  
  28. 	int sum = 0;
  29. 	int len = 0;
  30. 	unordered_map<int,int> mp = {{0, 0}};
  31.  
  32. 	for(int i=0; i<n; i++){
  33. 		sum += a[i];
  34. 		if(mp.count(sum-k)){
  35. 			len = max(len, i-mp[sum-k]);
  36. 		}
  37. 		if(!mp.count(sum)) mp[sum] = i;
  38. 	}
  39.  
  40. 	int s = 0 , e= 0;
  41. 	sum = 0;
  42. 	while(e<n){
  43. 		sum += a[e];
  44. 		if(e-s+1<len){
  45. 			e++;
  46. 		}else{
  47. 			if(sum==k){
  48. 				cout << s << ", " << e << endl;
  49. 				return;
  50. 			}
  51. 			sum -= a[s];
  52. 			s++;
  53. 			e++;
  54. 		}
  55. 	}
  56. 	cout << "-1" << endl;
  57.  
  58. }
  59.  
  60. void solve() {
  61.  
  62. 	int n, k;
  63. 	cin >> n >> k;
  64. 	a.resize(n);
  65. 	for(int i=0; i<n; i++) cin >> a[i];
  66.     consistency(n, k) ;
  67.  
  68. }
  69.  
  70.  
  71.  
  72.  
  73.  
  74. int32_t main() {
  75.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  76.  
  77.     int t = 1;
  78.     while (t--) {
  79.         solve();
  80.     }
  81.  
  82.     return 0;
  83. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/nUH5ue
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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