diff --git a/src/7/20/T635780.cpp b/src/7/20/T635780.cpp
index 05fce69..156159a 100644
--- a/src/7/20/T635780.cpp
+++ b/src/7/20/T635780.cpp
@@ -1,9 +1,19 @@
 #include <cstdio>
+#include <set>
 #include <vector>
 using ll = long long;
 
-ll n,k;
-std::vector<ll> a;
+ll n,k,ans{};
+std::vector<ll> a,s;
+std::multiset<ll> se;
+#define NV(v)do{printf("%s",#v);printf(" : %lld\n",(v));}while(0)
+
+void addAns(ll n){
+    se.insert(n);
+    if(se.size()>k){
+        se.erase(--se.end());
+    }
+}
 
 int main(){
     scanf("%lld%lld",&n,&k);
@@ -11,5 +21,20 @@ int main(){
     for(ll i=1;i<(ll)a.size();i++){
         scanf("%lld",&a[i]);
     }
-    
+    s.resize(a.size());
+    for(ll i=1;i<(ll)s.size();i++){
+        s[i]=s[i-1]+a[i];
+    }
+    for(ll i=1;i<(ll)s.size();i++){
+        for(ll j=i;j<(ll)s.size();j++){
+            addAns(s[j]-s[i-1]);
+        }
+    }
+    for(ll i=1;i<=k;i++){
+        static auto it = se.begin();
+        ans+=*it;
+        // NV(*it);
+        it++;
+    }
+    printf("%lld\n",ans);
 }
\ No newline at end of file