[BOJ 11723]

strcmp를 사용하기 위해서 <cstring> 추가

	#include <cstdio>
	#include <cstring>
	#include <vector>
	using namespace std;
	bool check(vector<int> vec,int x){
	for (int i=0;i<vec.size();i++){
	if (vec[i] == x)
	return true;
	}
	return false;
	}
	void add(vector<int>& vec, int x){
	if (check(vec,x)) return;
	vec.push_back(x);
	}
	void erase(vector<int>& vec,int x){
	for (int i=0;i<vec.size();i++){
	if (vec[i] == x)
	vec.erase(vec.begin()+i);
	}
	}
	void toggle(vector<int>&vec, int x){
	for (int i=0;i<vec.size();i++){
	if (vec[i] == x){
	vec.erase(vec.begin()+i);
	return;
	}
	}
	vec.push_back(x);
	}
	void all(vector<int>&vec){
	vec.clear();
	for (int i=1;i<=20;i++)
	vec.push_back(i);
	}
	void empty(vector<int>&vec){
	vec.clear();
	}
	int main(void){
	int N;
	scanf("%d",&N);
	char ch;
	int x;
	vector<int> set;
	getchar();
	for (int i=0;i<N;i++){
	int idx=0;
	char cmd[10];
	while ((ch = getchar()) != ' ' && ch != '\n'){
	cmd[idx++] = ch;
	}
	cmd[idx] = NULL;
	if (strcmp(cmd,"add") == 0){
	scanf("%d",&x);
	add(set, x);
	getchar();
	}
	else if (strcmp(cmd,"remove") == 0){
	scanf("%d",&x);
	erase(set, x);
	getchar();
	}
	else if (strcmp(cmd,"check") == 0){
	scanf("%d",&x);
	if (check(set, x))
	printf("1\n");
	else
	printf("0\n");
	getchar();
	}
	else if (strcmp(cmd,"toggle") == 0){
	scanf("%d",&x);
	toggle(set, x);
	getchar();
	}
	else if (strcmp(cmd,"all") == 0){
	all(set);
	}
	else if (strcmp(cmd,"empty") == 0){
	empty(set);
	}
	}
	}

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