add 763 ts solution

Author: JeremyXXXuuu

Problems/19-Partition-Labels/763.ts

@@ -0,0 +1,21 @@
+function partitionLabels(s: string): number[] {
+    
+    let map: Map<string,number> = new Map();
+    let res: number[] = [];
+    
+    for(let i = 0; i < s.length; i++) {
+        map.set(s[i],i);
+    }
+
+    let start = 0, end = 0;
+    for(let i = 0; i < s.length; i++) {
+        end = Math.max(map.get(s[i])!, end);
+        if(i === end){
+            end = i;
+            res.push(end - start + 1);
+            start = end+1;
+        }
+    }
+    return res;
+
+};