C++涓殑`std::map::find`鏂规硶鍙兘杩斿洖涓€涓粨鏋溿€傚畠鐢ㄤ簬鏌ユ壘涓庣粰瀹氶敭鍏宠仈鐨勭涓€涓厓绱犮€傚鏋滄壘鍒板尮閰嶇殑鍏冪礌锛宍find`鏂规硶灏嗚繑鍥炰竴涓寚鍚戣鍏冪礌鐨勮凯浠ｅ櫒锛涘鏋滄病鏈夋壘鍒板尮閰嶇殑鍏冪礌锛屽畠灏嗚繑鍥炰竴涓寚鍚慲map`鐨刞end()`杩唬鍣ㄣ€?/p>

濡傛灉浣犻渶瑕佽繑鍥炲涓粨鏋滐紙鍗冲湪`map`涓壘鍒版墍鏈夊叿鏈夌浉鍚岄敭鐨勫厓绱狅級锛屼綘鍙互浣跨敤浠ヤ笅鏇夸唬鏂规硶锛?/p>

1銆佷娇鐢ㄨ寖鍥磃or寰幆閬嶅巻`map`锛屽苟妫€鏌ユ瘡涓厓绱犵殑閿槸鍚︿笌鎵€闇€鐨勯敭鍖归厤銆傝繖绉嶆柟娉曞湪鏁堢巼涓婂彲鑳戒笉鏄渶浼樼殑锛屽洜涓哄畠浼氶亶鍘嗘暣涓猔map`锛岃€屼笉浠呬粎鏄湁鍖归厤閿殑閮ㄥ垎銆?/p>

```cpp

#include

#include

#include

int main() {

std::map my_map = {{1, "one"}, {2, "two"}, {2, "second_two"}, {3, "three"}};

int key_to_find = 2;

std::vector results;

for (const auto& pair : my_map) {

if (pair.first == key_to_find) {

results.push_back(pair.second);

}

}

for (const auto& result : results) {

std::cout<< result<< std::endl;

}

return 0;

}

```

2銆佺敱浜巂std::map`涓殑閿槸鍞竴鐨勶紝鍥犳鎷ユ湁澶氫釜鍏锋湁鐩稿悓閿殑鍏冪礌鎰忓懗鐫€杩欎簺鍏冪礌鍦ㄩ€昏緫涓婃槸绛変环鐨勩€傚湪杩欑鎯呭喌涓嬶紝浣犲彲鑳介渶瑕侀噸鏂拌€冭檻鏁版嵁缁撴瀯鐨勯€夋嫨銆備緥濡傦紝浣犲彲浠ヤ娇鐢╜std::multimap`鎴朻std::unordered_multimap`锛屽畠浠厑璁稿叿鏈夌浉鍚岄敭鐨勫涓厓绱犮€傜劧鍚庯紝浣犲彲浠ヤ娇鐢╜equal_range`鏂规硶鏉ユ壘鍒板叿鏈夌壒瀹氶敭鐨勬墍鏈夊厓绱犮€?/p>

```cpp

#include

#include

#include

int main() {

std::multimap my_map = {{1, "one"}, {2, "two"}, {2, "second_two"}, {3, "three"}};

int key_to_find = 2;

std::vector results;

auto range = my_map.equal_range(key_to_find);

for (auto it = range.first; it != range.second; ++it) {

results.push_back(it->second);

}

for (const auto& result : results) {

std::cout<< result<< std::endl;

}

return 0;

}

```

璇锋敞鎰忥紝`std::unordered_multimap`鐨勮涓轰笌`std::multimap`绫讳技锛屼絾鍦ㄦ彃鍏ュ拰鏌ユ壘鍏冪礌鏃朵笉淇濊瘉椤哄簭銆?/p>