aboutsummaryrefslogtreecommitdiff
path: root/other/sum_subarr_mins.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'other/sum_subarr_mins.cpp')
-rw-r--r--other/sum_subarr_mins.cpp30
1 files changed, 30 insertions, 0 deletions
diff --git a/other/sum_subarr_mins.cpp b/other/sum_subarr_mins.cpp
new file mode 100644
index 0000000..8f90e37
--- /dev/null
+++ b/other/sum_subarr_mins.cpp
@@ -0,0 +1,30 @@
+#include "leetcode.h"
+
+class Solution {
+public:
+ int sumSubarrayMins(vector<int> &arr) {
+ vector<long> s, sums(arr.size(), 0);
+ long j, ans = 0, mod = 1000000007;
+ for (int i = 0; i < arr.size(); ++i) {
+ while (!s.empty() && arr[s.back()] > arr[i])
+ s.pop_back();
+ j = !s.empty() ? s.back() : -1;
+ sums[i] = ((j >= 0 ? sums[j] : 0) + (i - j) * arr[i]) % mod;
+ s.push_back(i);
+ }
+ for (int i = 0; i < sums.size(); ++i)
+ ans = (ans + sums[i]) % mod;
+ return ans;
+ }
+};
+
+int main() {
+ Solution obj;
+ vector<int> arr = {
+ 117, 1315, 1336, 4213, 5634, 6288, 7640, 8533, 9688, 10186,
+ 10593, 11896, 13673, 14707, 15484, 17429, 19639, 20416, 21375, 23601,
+ 25800, 26485, 27893, 28026, 28695, 29121, 28642, 28023, 27642, 26324,
+ 23844, 22069, 21124, 20181, 18957, 15736, 15364, 13749, 13612, 11062,
+ 10319, 9755, 9367, 7977, 6463, 6049, 4886, 3071, 1331, 865};
+ cout << obj.sumSubarrayMins(arr);
+}