[2016-05-11][51nod][1016 水仙花数 V2]

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• 时间:2016-05-11 21:50:41 星期三

• 题目编号:[2016-05-11][51nod][1016 水仙花数 V2]

• 题目大意:水仙花数是指一个 n 位数 ( n≥3 )，它的每个位上的数字的 n 次幂之和等于它本身。（例如：1^3 + 5^3 + 3^3 = 153，1634 = 1^4 + 6^4 + 3^4 + 4^4）。

  给出一个整数M，求 >= M的最小的水仙花数。（10 <= M <= 10^60）

• 分析:10^60内,只有89个水仙花数,打表即可

0
1
2
3
4
5
6
7
8
9
153
370
371
407
1634
8208
9474
54748
92727
93084
548834
1741725
4210818
9800817
9926315
24678050
24678051
88593477
146511208
472335975
534494836
912985153
4679307774
32164049650
32164049651
40028394225
42678290603
44708635679
49388550606
82693916578
94204591914
28116440335967
4338281769391370
4338281769391371
21897142587612075
35641594208964132
35875699062250035
1517841543307505039
3289582984443187032
4498128791164624869
4929273885928088826
63105425988599693916
128468643043731391252
449177399146038697307
21887696841122916288858
27879694893054074471405
27907865009977052567814
28361281321319229463398
35452590104031691935943
174088005938065293023722
188451485447897896036875
239313664430041569350093
1550475334214501539088894
1553242162893771850669378
3706907995955475988644380
3706907995955475988644381
4422095118095899619457938
121204998563613372405438066
121270696006801314328439376
128851796696487777842012787
174650464499531377631639254
177265453171792792366489765
14607640612971980372614873089
19008174136254279995012734740
19008174136254279995012734741
23866716435523975980390369295
1145037275765491025924292050346
1927890457142960697580636236639
2309092682616190307509695338915
17333509997782249308725103962772
186709961001538790100634132976990
186709961001538790100634132976991
1122763285329372541592822900204593
12639369517103790328947807201478392
12679937780272278566303885594196922
1219167219625434121569735803609966019
12815792078366059955099770545296129367
115132219018763992565095597973971522400
115132219018763992565095597973971522401

• 遇到的问题:

  • 比较大小,不能直接使用string的重载<号,这时”4” > “300”
  • 应该在相等长度下才直接比较,不同长度直接比较长度即可
  • 最后,没有答案记得输出 No Solution

#include<string>
#include<iostream>
using namespace std;
string data[] = {"0","1","2","3","4","5","6","7","8","9","153","370","371","407","1634","8208","9474","54748","92727","93084","548834","1741725","4210818","9800817","9926315","24678050","24678051","88593477","146511208","472335975","534494836","912985153","4679307774","32164049650","32164049651","40028394225","42678290603","44708635679","49388550606","82693916578","94204591914","28116440335967","4338281769391370","4338281769391371","21897142587612075","35641594208964132","35875699062250035","1517841543307505039","3289582984443187032","4498128791164624869","4929273885928088826","63105425988599693916","128468643043731391252","449177399146038697307","21887696841122916288858","27879694893054074471405","27907865009977052567814","28361281321319229463398","35452590104031691935943","174088005938065293023722","188451485447897896036875","239313664430041569350093","1550475334214501539088894","1553242162893771850669378","3706907995955475988644380","3706907995955475988644381","4422095118095899619457938","121204998563613372405438066","121270696006801314328439376","128851796696487777842012787","174650464499531377631639254","177265453171792792366489765","14607640612971980372614873089","19008174136254279995012734740","19008174136254279995012734741","23866716435523975980390369295","1145037275765491025924292050346","1927890457142960697580636236639","2309092682616190307509695338915","17333509997782249308725103962772","186709961001538790100634132976990","186709961001538790100634132976991","1122763285329372541592822900204593","12639369517103790328947807201478392","12679937780272278566303885594196922","1219167219625434121569735803609966019","12815792078366059955099770545296129367","115132219018763992565095597973971522400","115132219018763992565095597973971522401"};
int main(){
        string str;
        cin>>str;
        int sz = str.length(),len;
        for(int i = 0 ; i < 89;++i){
                len = data[i].length();
                if((len == sz && data[i] >= str) || len > sz){
                        cout<<data[i]<<"\n";
                        return 0;
                }
        }
        puts("No Solution");
        return 0;
}

[2016-05-11][51nod][1016 水仙花数 V2]

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原文地址：http://www.cnblogs.com/qhy285571052/p/3f1cb4f6ddcf258d06784f0d07fa8b98.html