Create Point Distances with Shared Coordinate.cpp

Author: vns9

Point Distances with Shared Coordinate.cpp

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+// https://binarysearch.com/problems/Point-Distances-with-Shared-Coordinate
+
+int mindis(int i, vector<int>& v) {
+    int lo = 0;
+    int hi = v.size() - 1;
+    int currdiff = INT_MAX;
+    while (lo <= hi) {
+        int mid = lo + (hi - lo) / 2;
+        if (v[mid] < i) {
+            currdiff = min(currdiff, (int)abs(v[mid] - i));
+            lo = mid + 1;
+        } else if (v[mid] > i) {
+            currdiff = min(currdiff, (int)abs(v[mid] - i));
+            hi = mid - 1;
+        } else {
+            if (mid - 1 >= 0) currdiff = min(currdiff, (int)abs(v[mid - 1] - i));
+            if (mid + 1 < v.size()) currdiff = min(currdiff, (int)abs(v[mid + 1] - i));
+            break;
+        }
+    }
+    return currdiff;
+}
+vector<int> solve(vector<vector<int>>& points) {
+    unordered_map<int, vector<int>> xtoy;
+    unordered_map<int, vector<int>> ytox;
+    for (auto point : points) {
+        xtoy[point[0]].push_back(point[1]);
+        ytox[point[1]].push_back(point[0]);
+    }
+    for (auto kv : xtoy) {
+        sort(xtoy[kv.first].begin(), xtoy[kv.first].end());
+    }
+    for (auto kv : ytox) {
+        sort(ytox[kv.first].begin(), ytox[kv.first].end());
+    }
+    vector<int> manhat;
+    for (auto point : points) {
+        manhat.push_back(min(mindis(point[1], xtoy[point[0]]), mindis(point[0], ytox[point[1]])));
+    }
+    return manhat;
+}