20240403-算法复习打卡day43||● 1049. 最后一块石头的重量 II ● 494. 目标和 ● 474.一和零

class Solution {
public:int lastStoneWeightII(vector<int>& stones) {vector<int> dp(15001, 0);int sum = 0;for (int i = 0; i < stones.size(); i++) sum += stones[i];int target = sum / 2;for (int i = 0; i < stones.size(); i++) {for (int j = target; j >= stones[i]; j--) {dp[j] = max(dp[j], dp[j - stones[i]] + stones[i]);}}return sum - dp[target] - dp[target];}
};

class Solution {
public:int findTargetSumWays(vector<int>& nums, int target) {int sum = 0;for (int i = 0; i < nums.size(); i++) sum += nums[i];if (abs(target) > sum) return 0;if ((target + sum) % 2 == 1) return 0;int bagSize = (target + sum) / 2;vector<int> dp(bagSize + 1, 0);dp[0] = 1;for (int i = 0; i < nums.size(); i++) {for (int j = bagSize; j >= nums[i]; j--) {dp[j] += dp[j - nums[i]];}}return dp[bagSize];}
};

class Solution {
public:int findMaxForm(vector<string>& strs, int m, int n) {vector<vector<int>> dp(m + 1, vector<int> (n + 1, 0));for (string str : strs) {int oneNum = 0, zeroNum = 0;for (char c : str) {if (c == '0') zeroNum++;else oneNum++;}for (int i = m; i >= zeroNum; i--) {for (int j = n; j >= oneNum; j--) {dp[i][j] = max(dp[i][j], dp[i - zeroNum][j - oneNum] + 1)}}}return dp[m][n];}
};