成绩:
预计分数:20+10+40
实际分数:100+10+40.
一百三十多人的比赛全场rand7还水了个鼠标+键盘
unbelievable!
考试题目链接:
https://www.luogu.org/team/show?teamid=1353
T1
1 #include<iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<cmath> 5 #include<algorithm> 6 #include<queue> 7 #include<stack> 8 #define lli long long 9 using namespace std; 10 const int mod=998244353; 11 void read(int &n) 12 { 13 char c=‘+‘;int x=0;bool flag=0; 14 while(c<‘0‘||c>‘9‘){c=getchar();if(c==‘-‘)flag=1;} 15 while(c>=‘0‘&&c<=‘9‘) 16 x=(x<<1)+(x<<3)+c-48,c=getchar(); 17 flag==1?n=-x:n=x; 18 } 19 lli n,m; 20 int fastmul(int x,int p) 21 { 22 int now=x; 23 int ans=0; 24 while(p) 25 { 26 if(p&1) 27 { 28 --p; 29 ans=(ans+now)%mod; 30 } 31 p>>=1; 32 now=(now+now)%mod; 33 } 34 return (ans-1)%mod; 35 } 36 int main() 37 { 38 freopen("bpmp.in","r",stdin); 39 freopen("bpmp.out","w",stdout); 40 //read(n);read(m); 41 cin>>n>>m; 42 cout<<fastmul(n,m)%mod; 43 return 0; 44 }
T1快速乘
一开始搞了个贪心不知道对不对,所以不期望能拿多少分,但没想到居然AC了
而且我以为这个题没有那么水于是就写了个快速乘、
事实上只要输出(n*m-1)%mod 就能AC,
(表示差点被卡成rank8,没奖)
http://www.cnblogs.com/zwfymqz/p/7186080.html
T2
1 #include<iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<cmath> 5 #include<algorithm> 6 #include<queue> 7 #include<stack> 8 #include<cstdlib> 9 using namespace std; 10 inline void read(int &n) 11 { 12 char c=‘+‘;int x=0;bool flag=0; 13 while(c<‘0‘||c>‘9‘){c=getchar();if(c==‘-‘)flag=1;} 14 while(c>=‘0‘&&c<=‘9‘) 15 x=(x<<1)+(x<<3)+c-48,c=getchar(); 16 flag==1?n=-x:n=x; 17 } 18 int n,m; 19 struct node 20 { 21 int a[101][101]; 22 int nowmaxn; 23 int bgx,bgy,edx,edy; 24 }now,nxt; 25 int ans=-0x7ffff; 26 queue<node>q; 27 int tot=0; 28 inline void calc() 29 { 30 /*memset(nxt.a,0,sizeof(nxt.a)); 31 for(int i=now.bgx;i<=now.edx;i++) 32 for(int j=now.bgy;j<=now.edy;j++) 33 nxt.a[i][j]=now.a[i][j];*/ 34 nxt=now; 35 } 36 inline void print() 37 { 38 39 for(int i=now.bgx;i<=now.edx;i++) 40 { 41 for(int j=now.bgy;j<=now.edy;j++) 42 printf("%d ",now.a[i][j]); 43 printf("\n"); 44 } 45 printf("*********************************\n"); 46 } 47 inline void getans() 48 { 49 for(int i=now.bgx;i<=now.edx;i++) 50 for(int j=now.bgy;j<=now.edy;j++) 51 ans=max(ans,now.a[i][j]); 52 } 53 void check() 54 { 55 tot++; 56 //cout<<tot<<"---"<<endl; 57 if(tot>63843800) 58 { 59 cout<<ans; 60 exit(0); 61 } 62 63 } 64 inline void bfs(int hc,int lc) 65 { 66 q.push(now); 67 while(!q.empty()) 68 { 69 now=q.front(); 70 q.pop(); 71 int num=0; 72 for(int i=now.bgx;i<=now.edx;i++) 73 for(int j=now.bgy;j<=now.edy;j++) 74 if(now.a[i][j]>0) 75 num+=now.a[i][j],check(); 76 if(ans>num) 77 continue; 78 79 getans(); 80 calc(); 81 // print(); 82 for(int i=now.bgy;i<now.edy;i++)//横向折叠 83 { 84 for(int j=1;j<=(min((i-now.bgy),(now.edy-i))+1);j++) 85 { 86 for(int k=1;k<=now.edx;k++) 87 { 88 nxt.a[k][i+j]+=nxt.a[k][i-j+1]; 89 nxt.a[k][i-j+1]=0; 90 check(); 91 } 92 } 93 // cout<<now.bgy<<"&"<<i<<endl; 94 nxt.bgy=i+1; 95 // cout<<nxt.bgy<<"^"<<endl; 96 nxt.edy=max(now.edy,i+i-now.bgy+1); 97 nxt.bgx=now.bgx; 98 nxt.edx=now.edx; 99 q.push(nxt); 100 calc(); 101 } 102 for(int i=now.bgx;i<now.edx;i++) 103 { 104 for(int j=1;j<=(min((i-now.bgx),(now.edx-i+1))+1);j++) 105 { 106 for(int k=1;k<=now.edy;k++) 107 { 108 nxt.a[i+j][k]+=nxt.a[i-j+1][k]; 109 nxt.a[i-j+1][k]=0; 110 check(); 111 } 112 } 113 nxt.edy=now.edy; 114 nxt.bgy=now.bgy; 115 nxt.bgx=i+1; 116 nxt.edx=max(now.edx,i+i-now.bgx+1); 117 q.push(nxt); 118 calc(); 119 } 120 } 121 122 } 123 int main() 124 { 125 freopen("cfyw.in","r",stdin); 126 freopen("cfyw.out","w",stdout); 127 read(n);read(m); 128 for(int i=1;i<=n;i++) 129 for(int j=1;j<=m;j++) 130 read(now.a[i][j]); 131 now.bgx=now.bgy=1; 132 now.edx=n; 133 now.edy=m; 134 bfs(0,0); 135 printf("%d",ans); 136 return 0; 137 }
T2爆搜
一开始以为是矩阵什么乱七八糟的肯定不会于是就写超级暴力广搜,
本来以为能过50%的数据结果发现连4*4的都跑不出来。
没办法加了个最优性剪枝又加了个卡时,
结果。
除了第一个点AC其他全MLE,,,,,,,,,,,,,
What‘ a pity!
http://www.cnblogs.com/zwfymqz/p/7185970.html
T3
1 #include<iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<cmath> 5 #include<algorithm> 6 #include<queue> 7 #include<stack> 8 #define lli long long int 9 using namespace std; 10 inline void read(int &n) 11 { 12 char c=‘+‘;int x=0;bool flag=0; 13 while(c<‘0‘||c>‘9‘){c=getchar();if(c==‘-‘)flag=1;} 14 while(c>=‘0‘&&c<=‘9‘) 15 x=(x<<1)+(x<<3)+c-48,c=getchar(); 16 flag==1?n=-x:n=x; 17 } 18 int mod=998244353; 19 int n,m; 20 int ans=0; 21 int gcd(int a,int b) 22 { 23 return b==0?a%mod:gcd(b,a%b)%mod; 24 } 25 int hash[40000001]; 26 int main() 27 { 28 //freopen("hoip.in","r",stdin); 29 // freopen("hoip.out","w",stdout); 30 read(n);read(m); 31 if(n<4000&&m<4000) 32 { 33 for(int i=1;i<=n;i++) 34 for(int j=1;j<=m;j++) 35 ans=(ans+gcd(i,j))%mod; 36 printf("%d",ans%mod); 37 } 38 else if(n>6001&&m>6001) 39 { 40 printf("0"); 41 } 42 else 43 { 44 for(int i=1;i<=n;i++) 45 for(int j=1;j<=m;j++) 46 { 47 if(hash[(i*257)%23456789+(j*359)%23456789]) 48 { 49 ans+=hash[(i*257)%23456789+(j*359)%23456789]; 50 continue; 51 } 52 lli p=gcd(i,j)%mod; 53 lli a=i,b=j; 54 while(a<n&&b<m) 55 { 56 p=p+p; 57 a=a+a; 58 b=b+b; 59 hash[(i*257)%23456789+(j*359)%23456789]=p; 60 } 61 } 62 printf("%d",ans); 63 } 64 return 0; 65 }
T3暴力+打表
暴力暴力暴力!!!
http://www.cnblogs.com/zwfymqz/p/7189521.html
总结:
这次考试也是比较无语,
感觉自己运气成分比较大,
全场40多个140分.......
也就是说T2接近150行的暴力救了我一命=.=///
不过我们学校居然有A了T3的(但那孩子T1炸了。。。)
以后继续努力吧!
时间: 2024-12-28 16:40:43