湖南多校第2场
A：太水 队友直接秒了
C: Hedwig's Ladder
队友打了个表，然后一眼规律 类似于斐波拉契
1 #include <cstdio> 2 #include <cstring> 3 #include <queue> 4 #include <cmath> 5 #include <algorithm> 6 #include <set> 7 #include <iostream> 8 #include <map> 9 #include <stack> 10 #include <string> 11 #include <vector> 12 #include <bits/stdc++.h> 13 #define pi acos(-1.0) 14 #define eps 1e-9 15 #define fi first 16 #define se second 17 #define rtl rt<<1 18 #define rtr rt<<1|1 19 #define bug printf("******\n") 20 #define mem(a,b) memset(a,b,sizeof(a)) 21 #define name2str(x) #x 22 #define fuck(x) cout<<#x" = "<<x<<endl 23 #define f(a) a*a 24 #define sf(n) scanf("%d", &n) 25 #define sff(a,b) scanf("%d %d", &a, &b) 26 #define sfff(a,b,c) scanf("%d %d %d", &a, &b, &c) 27 #define sffff(a,b,c,d) scanf("%d %d %d %d", &a, &b, &c, &d) 28 #define pf printf 29 #define FRE(i,a,b) for(i = a; i <= b; i++) 30 #define FREE(i,a,b) for(i = a; i >= b; i--) 31 #define FRL(i,a,b) for(i = a; i < b; i++)+ 32 #define FRLL(i,a,b) for(i = a; i > b; i--) 33 #define FIN freopen("data.txt","r",stdin) 34 #define gcd(a,b) __gcd(a,b) 35 #define lowbit(x) x&-x 36 #define rep(i,a,b) for(int i=a;i<b;++i) 37 #define per(i,a,b) for(int i=a-1;i>=b;--i) 38 using namespace std; 39 typedef long long LL; 40 typedef unsigned long long ULL; 41 const int INF = 0x3f3f3f3f; 42 const LL INFLL = 0x3f3f3f3f3f3f3f3fLL; 43 const int maxn = 1e6 + 7; 44 const int mod = 10007; 45 int T,n,a[maxn]; 46 int main() { 47 sf(T); 48 a[1]=2,a[2]=3,a[3]=6; 49 for (int i=4 ;i<=1000 ;i++) a[i]=(a[i-1]+a[i-2]+(i%2!=0))%mod; 50 for (int t=1,x ;t<=T ;t++){ 51 sff(x,n); 52 printf("%d %d\n",t,a[n]); 53 } 54 return 0 ; 55 }
E: What time is it anyway?
我的两个SB队友小时也用%02d输出，卡了一年，我在看其他的题目，认为他们两个可以很容易写了，后面我看不下去了，发现他们用小时输出用%02d 当时心态就崩了
题意：模拟题 给你n个时间，和n个相差的时间，让你求你这n个表都一一对应的时间只有一个合法解就输出时间 多个就输出数目 没有输出none
1 #include <cstdio> 2 #include <cstring> 3 #include <queue> 4 #include <cmath> 5 #include <algorithm> 6 #include <set> 7 #include <iostream> 8 #include <map> 9 #include <stack> 10 #include <string> 11 #include <vector> 12 #include <bits/stdc++.h> 13 #define pi acos(-1.0) 14 #define eps 1e-9 15 #define fi first 16 #define se second 17 #define rtl rt<<1 18 #define rtr rt<<1|1 19 #define bug printf("******\n") 20 #define mem(a,b) memset(a,b,sizeof(a)) 21 #define name2str(x) #x 22 #define fuck(x) cout<<#x" = "<<x<<endl 23 #define f(a) a*a 24 #define sf(n) scanf("%d", &n) 25 #define sff(a,b) scanf("%d %d", &a, &b) 26 #define sfff(a,b,c) scanf("%d %d %d", &a, &b, &c) 27 #define sffff(a,b,c,d) scanf("%d %d %d %d", &a, &b, &c, &d) 28 #define pf printf 29 #define FRE(i,a,b) for(i = a; i <= b; i++) 30 #define FREE(i,a,b) for(i = a; i >= b; i--) 31 #define FRL(i,a,b) for(i = a; i < b; i++)+ 32 #define FRLL(i,a,b) for(i = a; i > b; i--) 33 #define FIN freopen("data.txt","r",stdin) 34 #define gcd(a,b) __gcd(a,b) 35 #define lowbit(x) x&-x 36 #define rep(i,a,b) for(int i=a;i<b;++i) 37 #define per(i,a,b) for(int i=a-1;i>=b;--i) 38 using namespace std; 39 typedef long long LL; 40 typedef unsigned long long ULL; 41 const int INF = 0x3f3f3f3f; 42 const LL INFLL = 0x3f3f3f3f3f3f3f3fLL; 43 const int maxn = 1e6 + 7; 44 int T, n, num1[12], num2[12], num3[12]; 45 map<int, int>vis; 46 set<int>ans; 47 int main() { 48 // FIN; 49 sf ( T ); 50 for ( int t = 1, x ; t <= T ; t++ ) { 51 ans.clear(); 52 sff ( x, n ); 53 for ( int i = 0, a, b ; i < n ; i++ ) { 54 scanf ( "%d:%d", &a, &b ); 55 num1[i] = a * 60 + b; 56 if (num1[i]>=720) num1[i]%=720; 57 } 58 getchar(); 59 char op; 60 for ( int i = 0, a, b ; i < n ; i++ ) { 61 scanf ( " %c%d:%d", &op, &a, &b ); 62 if ( op == '+' ) num2[i] = a * 60 + b; 63 else num2[i] = - ( a * 60 + b ); 64 vis[num2[i]]++; 65 } 66 for ( int i = 0 ; i < n ; i++ ) { 67 num3[i] = num1[0] - num2[i]; 68 if ( num3[i] < 0 ) num3[i] += 720; 69 if ( num3[i] >= 720 ) num3[i] %= 720; 70 } 71 for ( int i = 0 ; i < n ; i++ ) { 72 int flag = 1; 73 vis.clear(); 74 for ( int j = 0 ; j < n ; j++ ) vis[num1[j]]++; 75 for ( int j = 0 ; j < n ; j++ ) { 76 int cnt = num3[i] + num2[j]; 77 if ( cnt >= 720 ) cnt %= 720; 78 if ( cnt < 0 ) cnt += 720; 79 if ( !vis[cnt] ) { 80 flag = 0; 81 break; 82 } 83 vis[cnt]--; 84 } 85 if ( flag ) ans.insert( num3[i] ); 86 } 87 if ( ans.size() == 0 ) printf ( "%d none\n", t ); 88 else if ( ans.size() == 1 ) { 89 int a = *ans.begin() / 60, b = *ans.begin() % 60; 90 if ( a == 0 ) a = 12; 91 printf ( "%d %d:%02d\n", t, a, b ); 92 } else printf ( "%d %d\n", t, ans.size() ); 93 } 94 return 0 ; 95 }
H: Subprime Fibonacci Sequence
让你求出循环节 这题题目已经告诉你如何求出循环节了 然后被卡了好久 SB了 ak = am and ak − 1 = am − 1
找到两个相同的就行了，应该是这种数列的性质
1 #include <cstdio> 2 #include <cstring> 3 #include <queue> 4 #include <cmath> 5 #include <algorithm> 6 #include <set> 7 #include <iostream> 8 #include <map> 9 #include <stack> 10 #include <string> 11 #include <vector> 12 #include <bits/stdc++.h> 13 #define pi acos(-1.0) 14 #define eps 1e-9 15 #define fi first 16 #define se second 17 #define rtl rt<<1 18 #define rtr rt<<1|1 19 #define bug printf("******\n") 20 #define mem(a,b) memset(a,b,sizeof(a)) 21 #define name2str(x) #x 22 #define fuck(x) cout<<#x" = "<<x<<endl 23 #define f(a) a*a 24 #define sf(n) scanf("%d", &n) 25 #define sff(a,b) scanf("%d %d", &a, &b) 26 #define sfff(a,b,c) scanf("%d %d %d", &a, &b, &c) 27 #define sffff(a,b,c,d) scanf("%d %d %d %d", &a, &b, &c, &d) 28 #define pf printf 29 #define FRE(i,a,b) for(i = a; i <= b; i++) 30 #define FREE(i,a,b) for(i = a; i >= b; i--) 31 #define FRL(i,a,b) for(i = a; i < b; i++)+ 32 #define FRLL(i,a,b) for(i = a; i > b; i--) 33 #define FIN freopen("data.txt","r",stdin) 34 #define gcd(a,b) __gcd(a,b) 35 #define lowbit(x) x&-x 36 #define rep(i,a,b) for(int i=a;i<b;++i) 37 #define per(i,a,b) for(int i=a-1;i>=b;--i) 38 using namespace std; 39 typedef long long LL; 40 typedef unsigned long long ULL; 41 const int INF = 0x3f3f3f3f; 42 const LL INFLL = 0x3f3f3f3f3f3f3f3fLL; 43 const int maxn = 1e6 + 7; 44 int num, vis[maxn], prime[maxn], vis1[maxn]; 45 int T, n, a[1010],len, idx; 46 void init() { 47 num = 0, vis1[1] = 1; 48 for ( int i = 2 ; i < maxn ; i++ ) { 49 if ( vis[i] ) continue; 50 for ( int j = 2 * i ; j < maxn ; j += i ) vis[j] = 1; 51 vis1[i] = 1, prime[num++] = i; 52 } 53 } 54 int getnum ( int x ) { 55 if ( vis1[x] ) return x; 56 for ( int i = 0 ; i < num ; i++ ) 57 if ( x % prime[i] == 0 ) return x / prime[i]; 58 } 59 map<int, int>mp; 60 int main() { 61 //FIN; 62 init(); 63 sf ( T ); 64 for ( int t = 1, x ; t <= T ; t++ ) { 65 mp.clear(); 66 len = 0, idx = 0; 67 mem ( a, 0 ); 68 sffff ( x, n, a[0], a[1] ); 69 for ( int i = 2 ; i <= n ; i++ ) a[i] = getnum ( a[i - 1] + a[i - 2] ); 70 // for ( int i = 0 ; i <= n ; i++ ) printf ( "%d%c", a[i], i == n ? '\n' : ' ' ); 71 for ( int i = 0 ; i <= n-1 ; i++ ) { 72 if (mp[a[i]*10000+a[i+1]]) { 73 idx=i; 74 len=idx-mp[a[i]*10000+a[i+1]]; 75 break; 76 } 77 mp[a[i]*10000+a[i+1]]=i; 78 } 79 if ( !len ) printf ( "%d %d 0\n%d\n", t, n, a[n] ); 80 else { 81 for ( int i = 0, j = 0 ; i <= n ; i++ ) { 82 if ( a[i] == a[i + len] ) { 83 if ( j == 0 ) idx = i + len; 84 j++; 85 if ( j == 2 ) break; 86 } else j = 0; 87 } 88 printf ( "%d %d %d\n", t, idx + 1, len ); 89 int res = 0; 90 for ( int i = idx - len; i <= idx + 1; i++ ) { 91 res++; 92 if ( res == 20 || i == idx + 1 ) printf ( "%d\n", a[i] ), res = 0; 93 else printf ( "%d ", a[i] ); 94 } 95 // if ( res ) printf ( "\n" ); 96 } 97 } 98 return 0 ; 99 }
G: The Erdös-Straus Conjecture
这题没什么想法，大佬告诉我这题枚举就行了，后面发现开了10S枚举 也不会T
1 #include <cstdio> 2 #include <cstring> 3 #include <queue> 4 #include <cmath> 5 #include <algorithm> 6 #include <set> 7 #include <iostream> 8 #include <map> 9 #include <stack> 10 #include <string> 11 #include <vector> 12 #include <bits/stdc++.h> 13 #define pi acos(-1.0) 14 #define eps 1e-9 15 #define fi first 16 #define se second 17 #define rtl rt<<1 18 #define rtr rt<<1|1 19 #define bug printf("******\n") 20 #define mem(a,b) memset(a,b,sizeof(a)) 21 #define name2str(x) #x 22 #define fuck(x) cout<<#x" = "<<x<<endl 23 #define f(a) a*a 24 #define sf(n) scanf("%d", &n) 25 #define sff(a,b) scanf("%d %d", &a, &b) 26 #define sfff(a,b,c) scanf("%d %d %d", &a, &b, &c) 27 #define sffff(a,b,c,d) scanf("%d %d %d %d", &a, &b, &c, &d) 28 #define pf printf 29 #define FRE(i,a,b) for(i = a; i <= b; i++) 30 #define FREE(i,a,b) for(i = a; i >= b; i--) 31 #define FRL(i,a,b) for(i = a; i < b; i++)+ 32 #define FRLL(i,a,b) for(i = a; i > b; i--) 33 #define FIN freopen("data.txt","r",stdin) 34 #define gcd(a,b) __gcd(a,b) 35 #define lowbit(x) x&-x 36 #define rep(i,a,b) for(int i=a;i<b;++i) 37 #define per(i,a,b) for(int i=a-1;i>=b;--i) 38 using namespace std; 39 typedef long long LL; 40 typedef unsigned long long ULL; 41 const int INF = 0x3f3f3f3f; 42 const LL INFLL = 0x3f3f3f3f3f3f3f3fLL; 43 const int maxn = 1e6 + 7; 44 int T, t; 45 LL n, a, b, c; 46 void solve() { 47 a = n / 4 + 1; 48 while ( 1 ) { 49 LL x = 4 * a - n; 50 LL y = a * n; 51 LL temp = gcd ( x, y ); 52 x /= temp, y /= temp; 53 b = y / x + 1; 54 for ( ; b <= 2 * y / x ; b++ ) { 55 LL x1 = x * b - y; 56 LL y1 = y * b; 57 if ( y1 % x1 == 0 ) { 58 printf ( "%d %lld %lld %lld\n", t, a, b, y1/x1 ); 59 return ; 60 } 61 } 62 a++; 63 } 64 } 65 int main() { 66 sf ( T ); 67 for ( t = 1; t <= T ; t++ ) { 68 int x; 69 sff ( x, n ); 70 solve(); 71 } 72 return 0 ; 73 }