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source/Geometry/PointInConvexPolygon.cpp

@@ -0,0 +1,16 @@
+auto isunder = [](pii upper[], int u, pii x, bool inv = false){ // inv==true : isover
+    int r = inv?-1:1;
+    int idx = lower_bound(upper+1, upper+1+u, x, 
+       [&r](pii a, pii b){return r*a.fi<r*b.fi;}) - upper;
+    if(idx > u) return false;
+    if(idx == 1) {
+        if(r*x.fi < r*upper[1].fi) return false;
+        else {
+            int h = upper[1].se;
+            if(upper[2].fi == upper[1].fi) h = upper[2].se;
+            
+            return r*x.se <= r*h;
+        }
+    }
+    return ccw(upper[idx-1], upper[idx], x) <= 0;
+};