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    A recently found Ancient Prophesy is believed to contain the exact Apocalypse date. The prophesy is a string that only consists of digits and characters "-".

    We'll say that some date is mentioned in the Prophesy if there is a substring in the Prophesy that is the date's record in the format "dd-mm-yyyy". We'll say that the number of the date's occurrences is the number of such substrings in the Prophesy. For example, the Prophesy "0012-10-2012-10-2012" mentions date 12-10-2012 twice (first time as "0012-10-2012-10-2012", second time as "0012-10-2012-10-2012").

    The date of the Apocalypse is such correct date that the number of times it is mentioned in the Prophesy is strictly larger than that of any other correct date.

    A date is correct if the year lies in the range from 2013 to 2015, the month is from 1 to 12, and the number of the day is strictly more than a zero and doesn't exceed the number of days in the current month. Note that a date is written in the format "dd-mm-yyyy", that means that leading zeroes may be added to the numbers of the months or days if needed. In other words, date "1-1-2013" isn't recorded in the format "dd-mm-yyyy", and date "01-01-2013" is recorded in it.

    Notice, that any year between 2013 and 2015 is not a leap year.

    Input

    The first line contains the Prophesy: a non-empty string that only consists of digits and characters "-". The length of the Prophesy doesn't exceed 105 characters.

    Output

    In a single line print the date of the Apocalypse. It is guaranteed that such date exists and is unique.

    Examples

    Input
    777-444---21-12-2013-12-2013-12-2013---444-777
    Output
    13-12-2013

    字符串暴力匹配,没有算法,直接每次读20个字符,对字符进行分析,每次向前移动一个字符。复杂度 10^4*12 不会超时,比较简单
    #include<iostream>
    #include<queue>
    #include<algorithm>
    #include<set>
    #include<cmath>
    #include<vector>
    #include<map>
    #include<stack>
    #include<bitset>
    #include<cstdio>
    #include<cstring>
    //---------------------------------Sexy operation--------------------------//
    
    #define cini(n) scanf("%d",&n)
    #define cinl(n) scanf("%lld",&n)
    #define cinc(n) scanf("%c",&n)
    #define cins(s) scanf("%s",s)
    #define coui(n) printf("%d",n)
    #define couc(n) printf("%c",n)
    #define coul(n) printf("%lld",n)
    #define speed ios_base::sync_with_stdio(0)
    #define file  freopen("input.txt","r",stdin);freopen("output.txt","w",stdout)
    //-------------------------------Actual option------------------------------//
    
    #define Swap(a,b) a^=b^=a^=b
    #define Max(a,b) a>b?a:b
    #define Min(a,b) a<b?a:b
    #define mem(n,x) memset(n,x,sizeof(n))
    #define mp(a,b) make_pair(a,b)
    //--------------------------------constant----------------------------------//
    
    #define INF  0x3f3f3f3f
    #define maxn  100010
    #define esp  1e-9
    using namespace std;
    typedef long long ll;
    typedef pair<int,int> PII;
    //------------------------------Dividing Line--------------------------------//
    string s;
    char temp[15];
    int month[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
    map<string,int> mp;
    int main()
    {
        speed;
        cin>>s;
        int len = s.size();
        for(int i=0; i<=len-10; i++)
        {
            for(int j =0; j<10; j++) temp[j]=s[j+i];
            temp[10]='';
            if(temp[6]!='2'||temp[7]!='0'|| temp[8]!='1')
                continue;
            if(temp[9] != '3'&&temp[9]!= '4'&&temp[9]!='5')
                continue;
            if(temp[2]!='-'||temp[5]!='-')
                continue;
            if(!isdigit(temp[0])||!isdigit(temp[1])||!isdigit(temp[3])||!isdigit(temp[4])||!isdigit(temp[6])||!isdigit(temp[7])||!isdigit(temp[8])||!isdigit(temp[9]))
                continue;
            int mon=(temp[3]-'0')*10+temp[4]-'0';
            if(mon <=0||mon>12)continue;
            int day =(temp[0]-'0')*10+temp[1]-'0';
            if(day>month[mon]||day<=0)continue;
            mp[temp]++;
        }
        int maxx=0;
        string ans;
        for(auto xxxx=mp.begin(); xxxx!=mp.end(); xxxx++)
        {
            if(maxx<(xxxx->second))
            {
                maxx=xxxx->second;
                ans=xxxx->first;
            }
        }
        cout<<ans<<endl;
        return 0 ;
    }
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  • 原文地址:https://www.cnblogs.com/lunatic-talent/p/11386704.html
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