week9

70works/week9/work/day66_300_longest-increasing-subsequence.js

+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var lengthOfLIS = function(nums) {
+    let size = nums.length;
+   if (size < 2) return size;
+   let dp  = new Array(size).fill(1);
+   for (let i = 1; i < size; i++) {
+       for (let j = 0; j < i; j++) {
+           if (nums[i] > nums[j]) {
+               dp[i] = Math.max(dp[i], dp[j] + 1);
+           }
+       }
+   }
+   let res = 0;
+   for (let k =0; k < size; k++) {
+       res = Math.max(res, dp[k]);
+   }
+   return res;
+   };
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70works/week9/work/字符串/day69_8_string-to-integer-atoi.cpp

+// 自动机
+// 自动机
+#include<iostream>
+#include<vector>
+#include<unordered_map>
+#include<string>
+using namespace std;
+class  Atoi {
+    string state = "start";
+    unordered_map< string, vector<string> > table = {
+        {"start", {"start", "signed", "in_number", "end"}},
+        {"signed", {"end", "end", "in_number", "end"}},
+        {"in_number", {"end","end", "in_number", "end"}},
+        {"end" , {"end", "end", "end", "end"}},
+    };
+    // unordered_map<string, vector<string>> table = {
+    //     {"start", {"start", "signed", "in_number", "end"}},
+    //     {"signed", {"end", "end", "in_number", "end"}},
+    //     {"in_number", {"end", "end", "in_number", "end"}},
+    //     {"end", {"end", "end", "end", "end"}}
+    // };
+    public:
+    int sign = 1;
+    long long ans = 0;
+    int get_loc(char ch) {
+        if (isspace(ch)) return 0;
+        if (ch == '+' || ch == '-') return 1;
+        if (isdigit(ch)) return 2;
+        return 3;
+    }
+    void get(char ch) {
+        state = table[state][get_loc(ch)];
+        if (state == "in_number") {
+            ans = ans * 10 + ch -'0';
+            ans = sign == 1 ? std::min(ans, (long long)INT_MAX) : std::min(ans, -(long long)INT_MIN);  
+        } else if (state == "signed") {
+            sign = ch == '+' ? 1: -1;
+        }
+    }
+};
+class Solution {
+public:
+    int myAtoi(string s) {
+        Atoi atoi; 
+        for(auto ch : s) 
+            atoi.get(ch);
+        return atoi.sign * atoi.ans;
+    }
+};
+int main () {
+    string str = "-42";
+    Solution s;
+    s.myAtoi(str);
+    return 0;
+}
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