[hdu5199]统计数据的水题
题意：统计一个数出现了多少次，统计后删去它所有的出现。思路：乱搞。。自己没事写的hash，不过赶脚效率有点低。
1 #pragma comment(linker, "/STACK:10240000,10240000") 2 3 #include <iostream> 4 #include <cstdio> 5 #include <algorithm> 6 #include <cstdlib> 7 #include <cstring> 8 #include <map> 9 #include <queue> 10 #include <deque> 11 #include <cmath> 12 #include <vector> 13 #include <ctime> 14 #include <cctype> 15 #include <set> 16 17 using namespace std; 18 19 #define mem0(a) memset(a, 0, sizeof(a)) 20 #define lson l, m, rt << 1 21 #define rson m + 1, r, rt << 1 | 1 22 #define define_m int m = (l + r) >> 1 23 #define Rep(a, b) for(int a = 0; a < b; a++) 24 #define lowbit(x) ((x) & (-(x))) 25 #define constructInt4(name, a, b, c, d) name(int a = 0, int b = 0, int c = 0, int d = 0): a(a), b(b), c(c), d(d) {} 26 #define constructInt3(name, a, b, c) name(int a = 0, int b = 0, int c = 0): a(a), b(b), c(c) {} 27 #define constructInt2(name, a, b) name(int a = 0, int b = 0): a(a), b(b) {} 28 29 typedef double db; 30 typedef long long LL; 31 typedef pair<int, int> pii; 32 typedef multiset<int> msi; 33 typedef multiset<int>::iterator msii; 34 typedef set<int> si; 35 typedef set<int>::iterator sii; 36 typedef vector<int> vi; 37 38 const int dx[8] = {1, 0, -1, 0, 1, 1, -1, -1}; 39 const int dy[8] = {0, -1, 0, 1, -1, 1, 1, -1}; 40 const int maxn = 1e6 + 7; 41 const int maxm = 1e5 + 7; 42 const int maxv = 1e7 + 7; 43 const int max_val = 1e6 + 7; 44 const int MD = 1e9 +7; 45 const int INF = 1e9 + 7; 46 const double PI = acos(-1.0); 47 const double eps = 1e-10; 48 49 inline int ReadInt() { 50 char c = getchar(); 51 while(!isdigit(c)) c = getchar(); 52 53 int x = 0; 54 while(isdigit(c)) { 55 x = x * 10 + c - '0'; 56 c = getchar(); 57 } 58 return x; 59 } 60 61 inline void WriteInt(int i) { 62 int p = 0; 63 static int buf[10]; 64 if(i == 0) buf[p++] = 0; 65 else while(i) { 66 buf[p++] = i % 10; 67 i /= 10; 68 } 69 for(int j = p - 1; j >= 0; j--) putchar('0' + buf[j]); 70 } 71 template<class T> struct HashList { 72 vector<T> hash[max_val]; 73 HashList<T>() { } 74 void clear() { mem0(hash); } 75 void insert(T x) { hash[x % max_val].push_back(x); } 76 void erase(T x) { 77 int node = x % max_val; 78 for (int i = 0; i < hash[node].size(); i++) { 79 if (hash[node][i] == x) { 80 hash[node].erase(hash[node].begin() + i, hash[node].begin() + i + 1); 81 return ; 82 } 83 } 84 } 85 void erase_all(T x) { 86 int node = x % max_val; 87 for (int i = 0; i < hash[node].size(); i++) { 88 if (hash[node][i] == x) { 89 hash[node].erase(hash[node].begin() + i, hash[node].begin() + i + 1); 90 i--; 91 } 92 } 93 } 94 bool find(T x) { 95 int node = x % max_val; 96 for (int i = 0; i < hash[node].size(); i++) { 97 if (hash[node][i] == x) return true; 98 } 99 return false; 100 } 101 int find_cnt(T x) { 102 int node = x % max_val, cnt = 0; 103 for (int i = 0; i < hash[node].size(); i++) { 104 if (hash[node][i] == x) cnt++; 105 } 106 return cnt; 107 } 108 }; 109 110 HashList<int> Hash; 111 112 int main() { 113 //freopen("in.txt", "r", stdin); 114 int n, m; 115 while (cin >> n >> m) { 116 Hash.clear(); 117 for (int i = 0; i < n; i++) { 118 Hash.insert(ReadInt()); 119 } 120 for (int i = 0, x; i < m; i++) { 121 x = ReadInt(); 122 WriteInt(Hash.find_cnt(x)); 123 putchar('\n'); 124 Hash.erase_all(x); 125 } 126 } 127 return 0; 128 }
