[Week04] BOJ 1946: 신입 사원

weekly/week03/BOJ_1477_휴게소세우기/whqtker.cpp

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+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+vector<int> v;
+
+// 휴게소 간 최대 거리를 x로 했을 때, 설치 가능한 휴게소의 수를 리턴
+int chk(int x) {
+	int cnt = 0;
+	for (int i = 0; i < v.size() - 1; i++) {
+		int gap = v[i + 1] - v[i];
+
+		if (gap % x == 0) {
+			cnt += gap / x - 1;
+		}
+		else {
+			cnt += gap / x;
+		}
+	}
+
+	return cnt;
+}
+
+int main() {
+	int n, m, l;
+	cin >> n >> m >> l;
+
+	for (int i = 0; i < n; i++) {
+		int x;
+		cin >> x;
+		v.push_back(x);
+	}
+	v.push_back(0);
+	v.push_back(l);
+
+	sort(v.begin(), v.end());
+
+	int left = 1;
+	int right = l;
+	int mid;
+	while (left <= right) {
+		mid = (left + right) / 2; // mid: 휴게소 간 최대 거리
+
+		int cnt = chk(mid);
+
+		if (cnt <= m) {
+			right = mid - 1;
+		}
+		else {
+			left = mid + 1;
+		}
+	}
+
+	cout << left;
+}

weekly/week04/BOJ_14925_목장건설하기/whqtker.cpp

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+#include <iostream>
+#include <algorithm>
+
+using namespace std;
+
+int dp[1001][1001];
+
+int main() {
+	int n, m;
+	cin >> n >> m;
+
+	int ans = 0;
+	for (int i = 1; i <= n; i++) {
+		for (int j = 1; j <= m; j++) {
+			int x;
+			cin >> x;
+
+			if (x == 0) {
+				dp[i][j] = min({ dp[i - 1][j - 1],dp[i - 1][j],dp[i][j - 1] }) + 1;
+				ans = max(ans, dp[i][j]);
+			}
+		}
+	}
+
+	cout << ans;
+}

weekly/week04/BOJ_1946_신입사원/whqtker.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+#include <algorithm>
+#include <vector>
+
+using namespace std;
+
+int main() {
+	int T;
+	cin >> T;
+	while (T--) {
+		int n;
+		cin >> n;
+
+		vector<pair<int, int>> v;
+		for (int i = 0; i < n; i++) {
+			int a, b;
+			cin >> a >> b;
+			v.push_back({ a,b });
+		}
+
+		sort(v.begin(), v.end());
+
+		int cnt = 0; // 탈락한 애들 수
+
+		// 비교 원소 조건
+		// 이전보다 first가 클 것 (항상 만족)
+		// 이전보다 second가 작을 것
+		int cmpA = v[0].first;
+		int cmpB = v[0].second;
+		for (int i = 1; i < v.size(); i++) {
+			int curA = v[i].first;
+			int curB = v[i].second;
+
+			if (curA > cmpA && curB > cmpB) {
+				cnt++;
+			}
+			// 비교 원소 업데이트
+			else {
+				if (curB < cmpB) {
+					cmpA = curA;
+					cmpB = curB;
+				}
+			}
+		}
+
+		cout << n - cnt << "\n";
+	}
+}