From a810eeff443c46f6238ef103f63f7dbd6b900a79 Mon Sep 17 00:00:00 2001
From: Kirito <1362050620@qq.com>
Date: Tue, 2 Aug 2016 14:50:00 +0800
Subject: [PATCH] Create 1081.cpp

---
 HDOJ/1081.cpp | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 HDOJ/1081.cpp

diff --git a/HDOJ/1081.cpp b/HDOJ/1081.cpp
new file mode 100644
index 0000000..5322520
--- /dev/null
+++ b/HDOJ/1081.cpp
@@ -0,0 +1,106 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <algorithm>
+using namespace std;
+#define MAXN 128
+
+typedef int ARRAY[MAXN][MAXN];
+
+ARRAY pool;
+
+#define INF 0x3f3f3f3f
+#define NINF -INF-1
+/*
+int MaxSum(int N,int* a)
+{
+    int sum=0;
+    int tmp=0;
+    for(int i=0;i<N;i++)
+    {
+        if(tmp>0)
+        {
+            tmp+=a[i];
+        }
+        else
+        {
+            tmp=a[i];
+        }
+        if(tmp>sum)
+        {
+            sum=tmp;
+        }
+    }
+    return sum;
+}
+//*/
+int MaxSum(int n,int *a)
+{
+    int sum=NINF,b=0;
+    for(int i=0; i<n; i++)
+    {
+        if(b>0)
+        {
+            b+=a[i];
+        }
+        else
+        {
+            b=a[i];
+        }
+        if(b>sum)
+        {
+            sum = b;
+        }
+    }
+    return sum;
+}
+int MaxSumRect(int m,int n,ARRAY& a)
+{
+    int sum = NINF;
+    int* b = new int[n+1];
+    for(int i=0; i<m; i++)//枚举行
+    {
+        memset(b,0,sizeof(int)*(n+1));
+
+        for(int j=i; j<m; j++) //枚举初始行i,结束行j
+        {
+            for(int k=0; k<n; k++)
+            {
+                b[k] += a[j][k];//b[k]为纵向列之和
+            }
+            int max = MaxSum(n,b);
+            if(max>sum)
+            {
+                sum = max;
+            }
+
+        }
+    }
+    delete[] b;
+    return sum;
+}
+
+int MaxSumSquare(int N,ARRAY& a)
+{
+    return MaxSumRect(N,N,a);
+}
+
+
+int main()
+{
+    int n;
+    while(scanf("%d",&n)!=EOF)
+    {
+        memset(pool,0,sizeof(pool));
+        for(int i=0; i<n; i++)
+        {
+            for(int j=0; j<n; j++)
+            {
+                scanf("%d",&pool[i][j]);
+            }
+        }
+        int ans=MaxSumSquare(n,pool);
+        printf("%d\n",ans);
+    }
+    return 0;
+}