atcoder/abc181C

Author: xirc

atcoder/abc181/C/main.cpp

@@ -0,0 +1,40 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = int64_t;
+using ff = long double;
+
+int N;
+vector<int> xs, ys;
+
+bool solve() {
+    for (int i = 0; i < N; ++i) {
+        for (int j = 0; j < N; ++j) {
+            if (i == j) continue;
+            for (int k = 0; k < N; ++k) {
+                if (k == i || k == j) continue;
+                int lhs = (ys[j] - ys[i]) * (xs[k] - xs[j]);
+                int rhs = (ys[k] - ys[j]) * (xs[j] - xs[i]);
+                if (lhs == rhs) return true;
+            }
+        }
+    }
+    return false;
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    cin >> N;
+    xs.assign(N, 0);
+    ys.assign(N, 0);
+    for (int i = 0; i < N; ++i) {
+        cin >> xs[i] >> ys[i];
+    }
+
+    auto ans = solve() ? "Yes" : "No";
+    cout << ans << endl;
+
+    return 0;
+}