HDU-1297 Children’s Queue 

  1 #include <bits/stdc++.h>
  2 #define pb push_back
  3 #define _for(i,a,b) for(int i = (a);i < (b);i ++)
  4 #define INF 0x3f3f3f3f
  5 
  6 using namespace std;
  7 const int maxn = 2000;
  8 class HP
  9 {
 10     public : int len,s[maxn]; HP() {(*this) = 0;};
 11     HP(int inte) {(*this)=inte;}; HP(const char*str) {(*this)=str;};
 12     friend ostream& operator << (ostream &cout,const HP &x);
 13     HP operator = (int inte); HP operator = (const char*str);
 14     HP operator * (const HP &b);HP operator + (const HP &b);
 15     HP operator - (const HP &b);HP operator / (const HP &b);
 16     HP operator % (const HP &b);int Compare(const HP &b);
 17     bool operator < (const HP &b);
 18 };
 19 
 20 ostream& operator << (ostream &cout,const HP &x)
 21 {for(int i = x.len;i >= 1;i --) cout<<x.s[i];return cout;}
 22 
 23 HP HP::operator = (const char *str)
 24 {
 25     len = strlen(str);
 26     for(int i = 1;i <= len;i ++) s[i] = str[len-i]-'0';
 27     return (*this);
 28 }
 29 
 30 HP HP::operator = (int inte)
 31 {
 32     if(inte==0) {len = 1;s[1] = 0;return (*this);};
 33     for(len = 0;inte > 0;) {s[++len] = inte%10;inte /= 10;};
 34     return (*this);
 35 }
 36 
 37 HP HP::operator * (const HP&b)
 38 {
 39     int i,j;HP c;c.len = len+b.len;
 40     for(i = 1;i <= c.len;i ++) c.s[i] = 0;
 41     for(i = 1;i <=len;i ++) for(j = 1;j <=b.len;j ++) c.s[i+j-1]+=s[i]*b.s[j];
 42     for(i = 1;i < c.len;i ++) {c.s[i+1]+=c.s[i]/10;c.s[i]%=10;}
 43     while(c.s[i]) {c.s[i+1]=c.s[i]/10;c.s[i]%=10;i ++;}
 44     while(i>1&&!c.s[i]) i--;c.len = i;
 45     return c;
 46 }
 47 
 48 HP HP::operator+(const HP &b)
 49 {
 50     int i;HP c;c.s[1] = 0;
 51     for(i = 1;i <=len || i<=b.len || c.s[i];i ++)
 52     {
 53         if(i<=len) c.s[i]+=s[i];
 54         if(i<=b.len) c.s[i]+=b.s[i];
 55         c.s[i+1]=c.s[i]/10;c.s[i]%=10;
 56     }
 57     c.len = i-1;if(c.len==0) c.len = 1;
 58     return c;
 59 }
 60 
 61 HP HP::operator-(const HP&b)
 62 {
 63     int i, j;HP c;
 64     for(i = 1,j = 0;i <= len;i ++)
 65     {
 66         c.s[i] = s[i]-j;if(i<=b.len) c.s[i]-=b.s[i];
 67         if(c.s[i]<0){j = 1;c.s[i]+=10;}else j = 0;
 68     }
 69     c.len = len;while(c.len>1&&!c.s[c.len]) c.len--;
 70     return c;
 71 }
 72 
 73 int HP::Compare(const HP &y)
 74 {
 75     if(len>y.len) return 1;
 76     if(len<y.len) return -1;
 77     int i = len;
 78     while((i>1)&&(s[i]==y.s[i])) i--;
 79     return s[i]-y.s[i];
 80 }
 81 
 82 bool HP::operator < (const HP &y)
 83 {
 84     if(this->Compare(y)>=0)    return false;
 85     return true;
 86 }
 87 
 88 HP HP::operator / (const HP&b)
 89 {
 90     int i,j;HP d(0),c;
 91     for(i = len;i > 0;i --)
 92     {
 93         if(!(d.len==1 && d.s[1]==0))
 94             {for(j = d.len;j > 0;j --) d.s[j+1]=d.s[j];++d.len;}
 95         d.s[1] = s[i]; c.s[i] = 0;
 96         while((j = d.Compare(b))>=0)
 97             {d=d-b;c.s[i]++;if(j==0) break;}
 98     }
 99     c.len = len;while((c.len>1)&&(c.s[c.len]==0)) c.len--;
100     return c;
101 }
102 
103 HP HP::operator%(const HP&b)
104 {
105     int i,j;HP d(0);
106     for(i = len;i > 0;i --)
107     {
108         if(!(d.len==1 && d.s[1]==0))
109         {for(j = d.len;j > 0;j --) d.s[j+1]=d.s[j];++d.len;}
110     d.s[1] = s[i];
111     while((j = d.Compare(b))>=0) {d = d-b;if(j==0)break;}
112     }
113     return d;
114 }
115 
116 HP d[maxn];
117 HP solve(int n)
118 {
119     HP a = 0;
120     if(a < d[n])
121         return d[n];
122     
123     return d[n] = solve(n-1)+solve(n-2)+solve(n-4);
124 }
125 
126 int main()
127 {
128     int N;
129     d[1] = 1;
130     d[2] = 2;
131     d[3] = 4;
132     d[4] = 7;
133     for(int i = 4;i <= 1000;i ++)
134         solve(i);
135     while(~scanf("%d",&N))
136     {
137         cout << solve(N) << endl;
138     }
139     return 0; 
140 }

 

posted @ 2019-03-27 18:02  Asurudo  阅读(160)  评论(0)    收藏  举报