diff --git a/35.cpp b/35.cpp
new file mode 100644
index 0000000..953cfdd
--- /dev/null
+++ b/35.cpp
@@ -0,0 +1,54 @@
+// 120
+#include <bits/stdc++.h>
+using namespace std;
+int t;
+struct node
+{
+    int l, r, d;
+} arm[200005];
+map<int, int> qsum;
+int n;
+bool check(int now)
+{
+    pair<int, int> pre;
+    for (auto k : qsum)
+    {
+        if (pre.first < now && k.first >= now)
+        {
+            return k.second % 2;
+        }
+        pre = k;
+    }
+}
+int main()
+{
+    scanf("%d", &t);
+    while (t--)
+    {
+        scanf("%d", &n);
+        int maxr = 0;
+        qsum.clear();
+        for (int i = 1; i <= n; ++i)
+        {
+            scanf("%d%d%d", &arm[i].l, &arm[i].r, &arm[i].d);
+            for (int j = arm[i].l; j <= arm[i].r; j += arm[i].d)
+            {
+                qsum[j] += (j - arm[i].l + arm[i].d) / arm[i].d;
+                maxr = max(maxr, j);
+            }
+        }
+        if (qsum[maxr] % 2 == 0)
+            puts("There's no weakness.");
+        else
+        {
+            int l = 0, r = maxr, mid;
+            while (l < r)
+                if (check(mid))
+                    r = mid;
+                else
+                    l = mid + 1;
+            printf("%d\n", mid);
+        }
+    }
+    return 0;
+}
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