C++ 벡터 find()

1 개요

C++ 벡터 find()

2 값 위치 확인

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int getIndex(vector<int> v, int value) {
    auto it = find(v.begin(), v.end(), value);
    return it==v.end() ? -1 : it-v.begin();
}

int main() {
    vector<int> v = {11, 1, 12, 2};
    cout << getIndex(v, 2) << endl; // 3
    cout << getIndex(v, 3) << endl; // -1 (not exists)
}

3 값 있는지 확인

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    vector<int> v = {11, 1, 12, 2};
    cout << (find(v.begin(), v.end(), 2) != v.end()) << endl; // 1 (exists)
    cout << (find(v.begin(), v.end(), 3) != v.end()) << endl; // 0 (not exists)
}

4 같이 보기

• C++ 벡터
• C++ find()
• C++ 벡터 begin()
• C++ 벡터 end()

5 참고

• https://cplusplus.com/reference/algorithm/find/