update

src/7/16/T633667.cpp

@@ -0,0 +1,54 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <limits>
+#include <vector>
+
+using ll = int64_t;
+
+ll m,n,tot{};
+double ans{std::numeric_limits<double>::max()};
+std::vector<std::vector<ll>> s;
+
+ll getDownSum(ll b,ll e){
+    ll ans{};
+    for(ll i=1;i<=m;i++){
+        for(ll j=b;j<=e;j++){
+            ans+=s[i][j];
+        }
+    }
+    return ans;
+}
+double getAver(ll b,ll e){
+    double ans{};
+    for(ll i=1;i<=m;i++){\
+        ll sum{};
+        for(ll j=1;j<=n;j++){
+            if(b<=j&&j<=e){
+                continue;
+            }
+            sum+=s[i][j];
+        }
+        ans+=double(sum)/double(n);
+    }
+    return ans;
+}
+
+int main(){
+    std::cin>>m>>n;
+    s.resize(m+1,std::vector<ll>(n+1,0));
+    for(ll i=1;i<=m;i++){
+        for(ll j=1;j<=n;j++){
+            std::cin>>s[i][j];
+            tot+=s[i][j];
+        }
+    }
+
+    for(ll i=2;i<n;i++){
+        for(ll j=i;j<n;j++){
+            ans=std::min(getAver(i,j),ans);
+        }
+    }
+
+    std::cout<<ans<<'\n';
+}