87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
// 此程序仅用于对拍，并测试是否存在哈希冲突
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#include <cstdint>
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#include <cstdio>
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#include <fstream>
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#include <iostream>
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#include <set>
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#include <string>
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#include <unordered_map>
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typedef uint64_t hash_t;
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inline hash_t Hash(std::string str) noexcept {
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constexpr static char salt1[10] = "mL;]-=eT";
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constexpr static char salt2[10] = "9B<mF_me";
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constexpr static char inner_salt[17] = "si9aW@zl#2$3%4^!";
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/* Reference: http://xorshift.di.unimi.it/splitmix64.c */
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str = salt1 + str + salt2;
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hash_t ret = 0;
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int i = 0;
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for (; i + 8 <= str.length(); i += 8) {
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ret ^= *reinterpret_cast<const hash_t *>(str.c_str() + i);
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ret ^= *reinterpret_cast<const hash_t *>(inner_salt + (i & 15));
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ret += 0x9e3779b97f4a7c15;
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ret = (ret ^ (ret >> 30)) * 0xbf58476d1ce4e5b9;
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ret = (ret ^ (ret >> 27)) * 0x94d049bb133111eb;
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ret ^= ret >> 31;
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}
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for (; i < str.length(); ++i) {
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ret ^= str[i];
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ret ^= inner_salt[i & 15];
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ret += 0x9e3779b97f4a7c15;
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ret = (ret ^ (ret >> 30)) * 0xbf58476d1ce4e5b9;
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ret = (ret ^ (ret >> 27)) * 0x94d049bb133111eb;
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ret ^= ret >> 31;
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}
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return ret;
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}
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std::unordered_map<hash_t, std::set<int>> mp;
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int main() {
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std::fstream f("data.txt");
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hash_t key;
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int value;
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while (f >> key >> value) {
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mp[key].insert(value);
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}
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int n;
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std::cin >> n;
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std::string op;
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while (n-- > 0) {
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std::cin >> op;
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if (op == "insert") {
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std::string key;
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int value;
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std::cin >> key >> value;
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mp[Hash(key)].insert(value);
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} else if (op == "delete") {
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std::string key;
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int value;
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std::cin >> key >> value;
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hash_t hsh = Hash(key);
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mp[hsh].erase(value);
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if (mp[hsh].empty()) mp.erase(hsh);
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} else if (op == "find") {
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std::string key;
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int value;
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std::cin >> key;
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hash_t hsh = Hash(key);
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if (mp.find(hsh) == mp.end()) {
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std::cout << "null";
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} else {
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for (auto &x : mp[hsh]) {
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std::cout << x << ' ';
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}
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}
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std::cout << '\n';
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} else {
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std::cout << "Unknown operation\n";
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}
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}
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f.close();
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remove("data.txt");
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f.open("data.txt", std::ios::out);
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for (auto &x : mp) {
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for (auto &y : x.second) {
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f << x.first << ' ' << y << '\n';
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}
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}
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return 0;
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} |