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【HDUOJ】幾道遞推DP

題目 pac cout style http memset efi mem san

就不寫題解了。很基礎的遞推。


HDU2084數塔

題目鏈接:http://acm.hdu.edu.cn/showproblem.php?pid=2084

代碼:

 1 #include <iostream>
 2 #include <algorithm>
 3 #include <cstdio>
 4 #include <cstring>
 5 
 6 using namespace std;
 7 const int maxn = 105;
 8 
 9 int dp[maxn][maxn];
10 int
a[maxn][maxn]; 11 12 int main(){ 13 int T; 14 cin>>T; 15 while(T--){ 16 memset(a,0,sizeof(a)); 17 memset(dp,0,sizeof(dp)); 18 int n; 19 cin>>n; 20 for(int i = 1; i <= n ;i++){ 21 for(int j = 1; j <= i; j++){
22 cin>>a[i][j]; 23 } 24 } 25 26 for(int i = n; i > 0; i--){ 27 for(int j = 1; j <= n ;j++){ 28 dp[i][j] = max(dp[i+1][j] ,dp[i+1][j+1]) + a[i][j]; 29 } 30 } 31 cout<<dp[1][1
]<<endl; 32 } 33 34 35 return 0; 36 }


HDU2018母牛的故事

題目鏈接:http://acm.hdu.edu.cn/showproblem.php?pid=2018

代碼:

 1 #include <iostream>
 2 #include <algorithm>
 3 #include <cstdio>
 4 #include <cstring>
 5 
 6 using namespace std;
 7 const int maxn = 105;
 8 int dp[maxn];
 9 
10 void init(){
11     dp[1] = 1;
12     dp[2] = 2;
13     dp[3] = 3;
14     dp[4] = 4;
15     dp[5] = 6;
16     for(int i = 6; i <= 55; i++){
17         dp[i] = dp[i-1] + dp[i-3];
18     }
19 }
20 
21 int main(){
22     int n;
23     init();
24     while(cin>>n && n){
25         cout<<dp[n]<<endl;
26     }
27 
28     return 0;
29 }


HDU2044小蜜蜂的故事

同類型HDU2041

題目鏈接:http://acm.hdu.edu.cn/showproblem.php?pid=2044

代碼:

 1 #include <iostream>
 2 #include <algorithm>
 3 #include <cstdio>
 4 #include <cstring>
 5 #define ll long long
 6 using namespace std;
 7 const int maxn = 55;
 8 ll fib[maxn];
 9 
10 void init(){
11     fib[0] = 0;
12     fib[1] = 1;
13     fib[2] = 2;
14     for(int i = 3 ;i <= maxn ;i++){
15         fib[i] = fib[i-1] + fib[i-2];
16     }
17 }
18 
19 int main(){
20     init();
21     int n,m;
22     int T;
23     cin>>T;
24     while(T--){
25         cin>>n>>m;
26         cout<<fib[m-n]<<endl;
27     }
28 
29 
30     return 0;
31 }


HDU2050

題目鏈接:http://acm.hdu.edu.cn/showproblem.php?pid=2050

代碼:

 1 #include <iostream>
 2 #include <algorithm>
 3 #include <cstdio>
 4 #include <cstring>
 5 #define ll long long
 6 using namespace std;
 7 const int maxn = 10005;
 8 ll dp[maxn];
 9 
10 void init(){
11     dp[1] = 2;
12     dp[2] = 7;
13     for(int i = 3; i <= maxn; i++){
14         dp[i] = dp[i-1] + 4*(i-1) + 1;
15     }
16 }
17 
18 int main(){
19     int T;
20     cin>>T;
21     int n;
22     init();
23     while(T--){
24         cin>>n;
25         cout<<dp[n]<<endl;
26     }
27 
28     return 0;
29 }

【HDUOJ】幾道遞推DP