Create 2103.cpp

LeetCode/2103.cpp

@@ -0,0 +1,31 @@
+class Solution {
+public:
+    int countPoints(string rings) {
+        int rods[10] = {};
+        for(int i=0; i<rings.size(); i+=2) {
+            char c = rings[i];
+            int id = rings[i+1] - '0';
+
+            // printf("%c%d\n", c, id);
+
+            switch (c) {
+                case 'R':
+                rods[id] |= 0x100;
+                break;
+                case 'G':
+                rods[id] |= 0x10;
+                break;
+                case 'B':
+                rods[id] |= 0x1;
+                break;
+            }
+        }
+
+        int c = 0;
+        for(int i=0; i<10; i++) {
+            // printf("%d %d\n", i, rods[i]);
+            if (rods[i] == 0x111) c++;
+        }
+        return c;
+    }
+};