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363B.cpp

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+#include <iostream>
+#include<cmath>
+using namespace std;
+
+int main() {
+	int  n,k;
+	cin>>n>>k;
+	long long arr[n+8]={0};
+  // input + cumlative sum 
+	for(int  i=0;i<n;i++){
+		cin>>arr[i];
+		if(i){
+			arr[i]=arr[i-1]+arr[i];
+		}
+	}
+
+
+	int min=150000010;
+	   long long  minindex=0;
+	for(int i=0;i<=n-k;i++){
+		 	long long sum=0;
+		if(!i){
+			sum=arr[i+k-1];
+ 			if(sum<=min){
+				min=sum;
+				minindex=i;
+			}
+
+		}
+		else {
+			sum=arr[i+k-1]-arr[i-1];
+
+			if(sum<=min){
+				min=sum;
+				minindex=i;
+			}
+		}
+
+
+	}
+	cout<<++minindex<<endl; 
+	return 0;
+}