116 条题解

  • 22
    @ 2010-04-14 16:17:01

    我们设2001.11.4必败,推上去,即2001.10.4和2001.11.3必胜(此时m+d=偶数)再推上去是11.2,10.3,9.3,都是必败(此时m+d=奇数),以此类推……

    为什么9.30和11.30例外呢?

    因为9.30和11.30月份+1,即10.30和12.30,都是必败局面

    这种情况只有在8月与以后出现,为什么大家应该清楚

    2.29为奇数,必败

    没有2.29,剩2.28和3.1衔接也没问题,都是必胜

    12.31必败,1.1必胜(以上情况自己考虑)

    所以本题和年份完全没关系

    if(m=9)and(n=30)then writeln('YES')

    else if (m=11)and(n=30)then writeln('YES')

    else if not(odd(m+n))then writeln('YES')

    else writeln('NO');

    • @ 2014-08-24 21:47:45

      强!

    • @ 2014-09-08 21:16:44

      太强了!

    • @ 2015-04-02 20:10:53

      我想说10.30貌似是必胜局面,11.3是必胜局面,那么11.2必败。11.1必胜,10.31必败,10.30必胜 ==

    • @ 2015-08-27 16:23:37

      太帅了!
      强大的推论啊

    • @ 2016-09-30 19:32:33

      10月30是必胜局面,不是必败

    • @ 2016-09-30 19:35:45

      10月30是必胜局面,不是必败,所以9月30是必败

    • @ 2017-06-17 15:41:34

      用这种方法c++的记得空行……

    • @ 2017-08-15 13:21:59

      666666666666666666666666

    • @ 2018-10-31 19:18:08

      @Dream_Runner: 强大的推论,无可挑剔

    • @ 2019-08-03 09:47:11

      考古,太强辣Orz

    • @ 2019-08-18 13:05:32

      666,无可挑剔

  • 15
    @ 2016-10-21 17:04:01

    #include<cstdio>
    #include<iostream>
    using namespace std;
    int main()
    {
    printf("YES\n");
    printf("YES\n");
    printf("YES\n");
    printf("NO\n");
    printf("YES\n");
    printf("NO\n");
    printf("YES\n");
    printf("NO\n");
    printf("NO\n");
    printf("YES\n");
    printf("YES\n");
    printf("NO\n");
    printf("YES\n");
    printf("NO\n");
    printf("NO\n");
    printf("NO\n");
    printf("NO\n");
    printf("NO\n");
    printf("NO\n");
    printf("NO\n");
    printf("YES\n");
    printf("NO\n");
    printf("YES\n");
    printf("YES\n");
    printf("NO\n");
    return 0;
    }

    • @ 2018-05-11 22:59:23

      打表贼溜啊!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    • @ 2018-11-06 18:59:10

      这也对了!!!

    • @ 2024-08-04 09:36:22

      woc?!

  • 2
    @ 2017-11-26 13:44:01
    #include<iostream>
    #define py printf("YES\n")
    #define pn printf("NO\n")
    
    using namespace std;
    
    int a,b,c,n,stop=0;
    
    int main()
    {
        scanf("%d",&n);
        while(n--)
        {
            scanf("%d%d%d",&a,&b,&c);
            if((b==9&&c==30)||(b==1&&c==30)||((b+c)%2==0))py;
            else pn;
        }
        return 0;
    } 
    
  • 0
    @ 2015-09-16 20:46:16

    program exercise(input,output);
    var i,j,k,l,m:longint;
    f:array[1900..2020,1..12,1..31]of boolean;
    function day(x,y:longint):longint;
    begin
    if (y=1)or(y=3)or(y=5)or(y=7)or(y=8)or(y=10)or(y=12) then
    exit(31);
    if y>2 then
    exit(30);
    if (x mod 400=0)or((x mod 100>0)and(x mod 4=0)) then
    exit(29);
    exit(28);
    end;
    begin
    fillchar(f,sizeof(f),true);
    f[2001,11,4]:=false;
    f[2001,11,2]:=false;
    for i:=2001 downto 1900 do
    for j:=12 downto 1 do
    begin
    if (i=2001)and((j=12)or(j=11)) then
    continue;
    l:=day(i,j);
    for k:=l downto 1 do
    begin
    if k+1<=l then
    f[i,j,k]:=f[i,j,k+1]
    else
    if j+1<=12 then
    f[i,j,k]:=f[i,j+1,1]
    else
    f[i,j,k]:=f[i+1,1,1];
    if j<12 then
    f[i,j,k]:=f[i,j,k] and f[i,j+1,k]
    else
    f[i,j,k]:=f[i,j,k] and f[i+1,1,k];
    f[i,j,k]:=not f[i,j,k];
    end;
    end;
    readln(m);
    for i:=1 to m do
    begin
    readln(j,k,l);
    if (j<=2001)and(k<=12)and(l<=day(j,k))and(f[j,k,l]) then
    writeln('YES')
    else
    writeln('NO');
    end;
    end.

  • 0
    @ 2015-09-16 20:44:19

    program exercise(input,output);
    var i,j,k,l,m:longint;
    f:array[1900..2020,1..12,1..31]of boolean;
    function day(x,y:longint):longint;
    begin
    if (y=1)or(y=3)or(y=5)or(y=7)or(y=8)or(y=10)or(y=12) then
    exit(31);
    if y>2 then
    exit(30);
    if (x mod 400=0)or((x mod 100>0)and(x mod 4=0)) then
    exit(29);
    exit(28);
    end;
    begin
    fillchar(f,sizeof(f),true);
    f[2001,11,4]:=false;
    f[2001,11,2]:=false;
    for i:=2001 downto 1900 do
    for j:=12 downto 1 do
    begin
    if (i=2001)and((j=12)or(j=11)) then
    continue;
    l:=day(i,j);
    for k:=l downto 1 do
    begin
    if k+1<=l then
    f[i,j,k]:=f[i,j,k+1]
    else
    if j+1<=12 then
    f[i,j,k]:=f[i,j+1,1]
    else
    f[i,j,k]:=f[i+1,1,1];
    if j<12 then
    f[i,j,k]:=f[i,j,k] and f[i,j+1,k]
    else
    f[i,j,k]:=f[i,j,k] and f[i+1,1,k];
    f[i,j,k]:=not f[i,j,k];
    end;
    end;
    readln(m);
    for i:=1 to m do
    begin
    readln(j,k,l);
    if (j<=2001)and(k<=12)and(l<=day(j,k))and(f[j,k,l]) then
    writeln('YES')
    else
    writeln('NO');
    end;
    end.

  • 0
    @ 2015-08-03 15:36:18

    #include<iostream>
    using namespace std;
    int main()
    {
    int k;
    cin>>k;
    for(int i=1;i<=k;i++)
    {
    int y,m,d;
    cin>>y>>m>>d;
    if(m==9 && d==30) cout<<"YES"<<endl;
    else if(m==1 && d==30) cout<<"YES"<<endl;
    else if((m+d)%2==0) cout<<"YES"<<endl;
    else cout<<"NO"<<endl;
    }
    return 0;
    }

  • 0
    @ 2014-12-30 15:42:45

    #include<iostream>
    using namespace std;
    int main()
    {
    int k,y,m,d;
    cin>>k;
    while(k--)
    {
    cin>>y>>m>>d;
    if((m+d)%2==0||(d==30&&(m==1||m==9)))
    cout<<"YES"<<endl;
    else
    cout<<"NO"<<endl;
    }
    return 0;
    }

  • 0
    @ 2014-11-02 17:37:06

    #include<iostream>
    using namespace std;
    main()
    {
    int d,k,m,y;
    cin>>k;
    while(k--)
    {
    cin>>y>>m>>d;
    if(m==9&&d==30)
    cout<<"YES\n";
    else
    if(m==1&&d==30)
    cout<<"YES\n";
    else
    if(!((m+d)%2))
    cout<<"YES\n";
    else
    cout<<"NO\n";

    }
    }

  • 0
    @ 2014-08-19 09:36:30

    vijos题解

    #include <cstdio>

    using namespace std;

    int main()
    {
    int k;

    scanf("%d", &k);
    while (k--)
    {
    int y, m, d;
    scanf("%d %d %d", &y, &m, &d);
    if (m == 9 && d == 30)
    printf("YES\n");
    else if (m == 1 && d == 30)
    printf("YES\n");
    else if ((m + d) % 2 == 0)
    printf("YES\n");
    else
    printf("NO\n");
    }

    return 0;
    }

  • 0
    @ 2014-05-03 23:23:52

    小心:_2001年11月4日_是错的,其实是__2006年11月4日__……希望管理员能早点改过来

  • 0
    @ 2014-03-03 21:38:54

    #include <cstdlib>
    #include <iostream>
    #include <math.h>
    #include <time.h>
    #include <string.h>

    using namespace std;

    struct time{
    int year;
    int month;
    int day;
    };

    struct time a[100];

    int p[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int r[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};

    int ren(int a)
    {
    if(a%100==0 && a%400!=0)
    {
    return 0;
    }
    if(a%4==0)
    {
    return 1;
    }
    return 0;
    }

    int frist(struct time &a)
    {
    a.day++;
    if((a.month==1 && a.day>31)||(a.month==3 && a.day>31)||(a.month==5 && a.day>31)||
    (a.month==7 && a.day>31)||(a.month==8 && a.day>31)||(a.month==10 && a.day>31)||
    (a.month==12 && a.day>31))
    {
    a.day=1;
    a.month++;
    if(a.month>12)
    {
    a.month=1;
    a.year++;
    }
    }
    else if((a.month==4 && a.day>30)||(a.month==6 && a.day>30)||(a.month==9 && a.day>30)||
    (a.month==11 && a.day>30))
    {
    a.day=1;
    a.month++;
    }
    else if((a.month==2 && a.day>29 && ren(a.year)==1)||
    (a.month==2 && a.day>28 && ren(a.year)==0))
    {
    a.month++;
    a.day=1;
    }
    return 0;

    }

    int second(struct time &a)
    {
    a.month++;
    if(a.month>12)
    {
    a.month=1;
    a.year++;
    }
    if(ren(a.year)==0)
    {
    if(a.day>p[a.month])
    {
    a.day=p[a.month];
    // a.month++;
    /* if(a.month>12)
    {
    a.month=1;
    a.year++;
    }
    /
    }
    }
    else
    {
    if(a.day>r[a.month])
    {
    a.day=r[a.month];
    /
    a.month++;
    if(a.month>12)
    {
    a.month=1;
    a.year++;
    }
    */
    }
    }
    return 0;
    }

    int main(int argc,char *argv[])
    {
    int i,j,k,n;
    cin>>n;
    for(i=0;i<n;i++)
    {
    cin>>a[i].year>>a[i].month>>a[i].day;
    }
    for(i=0;i<n;i++)
    {
    // cout<<i<<endl;
    k=0;
    while(a[i].year<=2006)
    {
    frist(a[i]);
    if(a[i].year==2006 && a[i].month==11 && a[i].day==4)
    {
    cout<<"YES"<<endl;
    k=1;
    break;
    }

    else
    {
    second(a[i]);
    if(a[i].year==2006 && a[i].month==11 && a[i].day==4)
    {
    cout<<"NO"<<endl;
    k=1;
    break;
    }
    }
    }
    if(k==0)
    cout<<"NO"<<endl;
    }
    system("pause");
    return 0;
    }
    为什么不能AC

  • 0
    @ 2013-08-31 14:03:59
  • 0
    @ 2013-05-22 17:09:07

    谁先将日期变到2001.11.4谁就赢了。

    应该是
    谁先将日期变到2006.11.4谁就赢了。
    哇,太无耻了!!!
    害我WA好几次
    记忆搜索
    const
    mon:array[1..12]of longint= (31,28,31,30,31,30,31,31,30,31,30,31);
    var
    f:array[1900..2007,1..12,1..31]of 0..2;
    i,j,k,m,n,y,d:longint;
    function run(y:Longint):boolean;
    begin
    if ((y mod 4=0)and(y mod 100<>0))or(y mod 400=0) then exit(true);
    exit(false);
    end;
    function search(y,m,d:Longint):longint;
    var
    a,b:Longint;
    begin
    if m>12 then
    begin
    inc(y);
    m:=1;
    end;
    if (m<>2)or((m=2)and (not run(y)))then
    if d>mon[m] then
    begin
    inc(m);
    d:=1;
    end
    else
    else
    if d>mon[m]+1 then
    begin
    inc(m);
    d:=1;
    end;

    if m>12 then
    begin
    inc(y);
    m:=1;
    end;
    if (y>2006)or((y=2006)and(m>11))or((y=2006)and(m=11)and(d>4)) then exit(1);
    if f[y,m,d]<>0 then exit(f[y,m,d]);
    a:=1;
    if (mon[m mod 12 +1]>=d) then a:=search(y,m+1,d);
    b:=search(y,m,d+1);
    if (a=2)or(b=2) then f[y,m,d]:=1 else f[y,m,d]:=2;
    exit(f[y,m,d]);

    end;
    begin
    fillchar(f,sizeof(f),0);
    f[2006,11,4]:=2;
    read(n);
    for i:=1 to n do
    begin
    read(y,m,d);

    if search(y,m,d)=1 then writeln('YES')
    else
    writeln('NO');

    end;
    end.

  • 0
    @ 2012-08-24 16:41:35

    1900写成1990,害我交了5次全出WA!!!!

  • 0
    @ 2010-04-10 12:38:58

    const

    m:array[1..13] of integer=(31,28,31,30,31,30,31,31,30,31,30,31,0);

    var

    a:array[1..30011231] of byte;

    i,j,k,n:longint;

    s:string;

    year,month,day,g,p,q,x,y,z,get1,get2:longint;

    begin

    year:=2001; month:=11; day:=4;

    for i:=20011105 to 20011231 do

      a[i]:=1;

    while (year1900) or (month1) or (day1) do

      begin

       dec(day);

       if day=0 then

        begin

         dec(month);

         if month = 0 then

          begin

           dec(year);

           month:=12;

          end;

         day:=m[month];

         if (month=2) and (year mod 4 = 0) then inc(day);

        end;

       g:=year*10000+month*100+day;

    {get1}

       y:=month+1;

       x:=m[y]; if (y=2) and (year mod 4 = 0) and (year1900) then x:=x+1;

       if (y=day) then

        get1:=a[year*10000+(month+1)*100+day]

       else if (y=13) then

        get1:=a[(year+1)*10000+100+day]

       else

        get1:=1;

    {get2}

       y:=day+1; x:=month; z:=year;

       p:=m[x]; if (year mod 4 = 0) and (x=2) and (year1900) then inc(p);

       if p

  • 0
    @ 2010-04-07 19:48:05

    虽然看不懂数学方法,但还是。。。。。。

  • 0
    @ 2010-03-14 17:12:35

    是不是先操作,拥有主动权,然后就讨论11.4左右天数为30的月份;其余再用奇偶判断。

    哪位神牛能解释清楚不???

  • 0
    @ 2009-11-08 12:29:06

    记忆化搜索 这里是 关于两种增加方法的边界和月份年份改变判断问题的核心代码

    if day[a,b,c]0 then exit(day[a,b,c]);

    if runnian(a) then t:=2 else t:=1;

    if (b=12) then t2:=try1(a+1,1,c) else if (c>m[t,b+1])then t2:=1 else t2:=try1(a,b+1,c);

    if (b=12)and(c+1>m[t,b]) then t1:=try1(a+1,1,1) else if (c+1>m[t,b]) then t1:=try1(a,b+1,1) else t1:=try1(a,b,c+1);

    if (t1=1)and(t2=1) then begin day[a,b,c]:=2;exit(2) end else begin day[a,b,c]:=1;exit(1) end;

    无语

    编译通过...

    ├ 测试数据 01:运行超时|格式错误...

    ---|---|---|---|---|---|---|---|-

    Unaccepted 有效得分:0 有效耗时:0ms

    这个是边读边写

    编译通过...

    ├ 测试数据 01:答案正确... 0ms

    ---|---|---|---|---|---|---|---|-

    Accepted 有效得分:100 有效耗时:0ms

    这个是存下来一起写

    靠 竟然让我交5次

    事实证明 和年份没关系。

  • 0
    @ 2009-11-08 10:33:14

    奇偶性解法太难想了,常规解法还是递推

    Flag   Accepted

    题号   P1004

    类型(?)   模拟

    通过   1450人

    提交   4870次

    通过率   30%

    难度   2

  • 0
    @ 2009-11-07 15:10:54

    奇偶性解法真的太神奇了

    不过一组数据似乎不太好

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