diff --git a/week17/B_31997/hyxrxn/31997.cpp b/week17/B_31997/hyxrxn/31997.cpp
new file mode 100644
index 0000000..b96e13d
--- /dev/null
+++ b/week17/B_31997/hyxrxn/31997.cpp
@@ -0,0 +1,40 @@
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+int n, m, t;
+int arrive[202020];
+int leave[202020];
+long long st[202020];
+long long et[202020];
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+    cout.tie(nullptr);
+
+    cin >> n >> m >> t;
+    for (int i = 1; i <= n; i++) {
+        cin >> arrive[i] >> leave[i];
+    }
+
+    int c, d, s, e;
+    for (int i = 0; i < m; i++) {
+        cin >> c >> d;
+        s = max(arrive[c], arrive[d]);
+        e = min(leave[c], leave[d]);
+        if (s < e) {
+            st[s]++;
+            et[e]++;
+        }
+    }
+
+    cout << st[0] - et[0] << "\n";
+    for (int i = 1; i < t; i++) {
+        st[i] += st[i - 1];
+        et[i] += et[i - 1];
+        cout << st[i] - et[i] << "\n";
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/week17/C_31932/hyxrxn/31932.cpp b/week17/C_31932/hyxrxn/31932.cpp
new file mode 100644
index 0000000..240f58a
--- /dev/null
+++ b/week17/C_31932/hyxrxn/31932.cpp
@@ -0,0 +1,65 @@
+#include <iostream>
+#include <vector>
+#include <tuple>
+#include <queue>
+#include <algorithm>
+using namespace std;
+
+// 도착지점을 갈 수 있는 빙하 탐색하며 그 빙하에 도달할 수 있는 최댓값 갱신
+// 반복하며 시작 지점의 도달 최댓값 갱신
+// 도달 최댓값이 먹을 수 있는 연어의 최대 수일듯...
+
+int n, m;
+vector<vector<tuple<int, int, int>>> vec(101010);
+priority_queue<pair<int, int>> pq;
+int visit[101010] = {0};
+int until[101010] = {0};
+
+int main() {
+    cin >> n >> m;
+
+    int u, v, d, t;
+    for (int i = 0; i < m; i++) {
+        cin >> u >> v >> d >> t;
+        vec[u].push_back({v, d, t});
+        vec[v].push_back({u, d, t});
+    }
+
+    until[1] = -1;
+    visit[n] = 1;
+    for (const auto &item: vec[n]) {
+        int next = get<0>(item);
+        int dis = get<1>(item);
+        int tim = get<2>(item);
+
+        if (tim - dis >= 0) {
+            until[next] = max(until[next], tim - dis);
+            pq.push({until[next], next});
+        }
+    }
+
+    while (!pq.empty()) {
+        pair<int, int> a = pq.top();
+        pq.pop();
+        int pre = a.second;
+        int now = a.first;
+        visit[pre] = 1;
+
+        for (const auto &item: vec[pre]) {
+            int next = get<0>(item);
+            int dis = get<1>(item);
+            int tim = get<2>(item);
+
+            if (visit[next] == 0 && now <= tim) {
+                until[next] = max(until[next], now - dis);
+                pq.push({until[next], next});
+            }
+        }
+    }
+
+    cout << until[1];
+
+    return 0;
+}
+
+// 18에서 런타임에러
\ No newline at end of file