add javascript solutions

solution/011. Container With Most Water/Solution.js

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+const maxArea2 = function(height){
+  let result = 0;
+  for(let i = 0; i < height.length; i++){
+    for(let j = i + 1; j < height.length; j++){
+      result = Math.max(result, Math.min(height[i],height[j])*(j-i));
+    }
+  }
+  return result;
+};
+
+const maxArea = function(height){
+  let result = 0, l = 0, r = height.length - 1;
+  while(l < r){
+    result = Math.max(result, Math.min(height[l],height[r])*(r-l));
+    height[l] < height[r] ? l++ : r--;
+  }
+  return result;
+}

solution/191. Number of 1 Bits/Solution.js

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+const hammingWeight = function(n){
+  let result = 0;
+  while(n){
+    result += n & 1;
+    n = n >>> 1;
+  }
+  return result;
+}

solution/926. Flip String to Monotone Increasing/Solution.js

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+const minFlipsMonoIncr = function (S) {
+  let n = S.length;
+  let f = [];
+  for (let i = 0; i < n + 1; i++) {
+    f.push(0);
+  }
+  for (let i = 0; i < n; i++) {
+    f[i + 1] = f[i] + (S[i] === '1');
+  }
+  let ans = n;
+  for (let i = 0; i <= n; i++) {
+    let a = f[i];
+    let b = (n - i) - (f[n] - f[i]);
+    ans = Math.min(ans, b + a);
+  }
+  return ans;
+};