HDU_5538_House Building
House Building
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others)
Total Submission(s): 1958 Accepted Submission(s): 1223
Figure 1: A typical world in Minecraft.
Nyanko-san is one of the diehard fans of the game, what he loves most is to build monumental houses in the world of the game. One day, he found a flat ground in some place. Yes, a super flat ground without any roughness, it's really a lovely place to build houses on it. Nyanko-san decided to build on a n×m big flat ground, so he drew a blueprint of his house, and found some building materials to build.
While everything seems goes smoothly, something wrong happened. Nyanko-san found out he had forgotten to prepare glass elements, which is a important element to decorate his house. Now Nyanko-san gives you his blueprint of house and asking for your help. Your job is quite easy, collecting a sufficient number of the glass unit for building his house. But first, you have to calculate how many units of glass should be collected.
There are n rows and m columns on the ground, an intersection of a row and a column is a 1×1 square,and a square is a valid place for players to put blocks on. And to simplify this problem, Nynako-san's blueprint can be represented as an integer array ci,j(1≤i≤n,1≤j≤m). Which ci,j indicates the height of his house on the square of i-th row and j-th column. The number of glass unit that you need to collect is equal to the surface area of Nyanko-san's house(exclude the face adjacent to the ground).
First line of each test case is a line with two integers n,m.
The n lines that follow describe the array of Nyanko-san's blueprint, the i-th of these lines has m integers ci,1,ci,2,...,ci,m, separated by a single space.
1≤T≤50
1≤n,m≤50
0≤ci,j≤1000
3 3
1 0 0
3 1 2
1 1 0
3 3
1 0 1
0 0 0
1 0 1
20

- 计算立方体表面积
- 对于给出的每个高度,先算排除底面的表面积,然后减去旁边四面高度的min就是当前立方体表面积
#include <iostream>
#include <string>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <climits>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
using namespace std;
typedef long long LL ;
typedef unsigned long long ULL ;
const int maxn = 1e3 + ;
const int inf = 0x3f3f3f3f ;
const int npos = - ;
const int mod = 1e9 + ;
const int mxx = + ;
const double eps = 1e- ;
const double PI = acos(-1.0) ; int T, n, m, a[maxn][maxn];
LL ans;
int main(){
// freopen("in.txt","r",stdin);
// freopen("out.txt","w",stdout);
while(~scanf("%d",&T)){
while(T--){
ans=;
memset(a,,sizeof(a));
scanf("%d %d",&n,&m);
for(int i=;i<=n;i++)
for(int j=;j<=m;j++)
scanf("%d",&a[i][j]);
for(int i=;i<=n;i++)
for(int j=;j<=m;j++)
if(a[i][j])
ans+=(*a[i][j]+)
-min(a[i][j],a[i-][j])-min(a[i][j],a[i+][j])
-min(a[i][j],a[i][j-])-min(a[i][j],a[i][j+]);
printf("%lld\n",ans);
}
}
return ;
}
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