3480. 删除一个冲突对后最大子数组数目

src/main.rs

@@ -1,25 +1,30 @@
 struct Solution;
 impl Solution {
-    pub fn max_sum(mut nums: Vec<i32>) -> i32 {
-        nums.sort_by(|a,b| b.cmp(a));
-        let mut last = nums[0];
-        let mut ans = nums[0];
-        for i in 1..nums.len() {
-            let t = nums[i];
-            if t <= 0 {
-                break
+    pub fn max_subarrays(n: i32, mut conflicting_pairs: Vec<Vec<i32>>) -> i64 {
+        let mut arr: Vec<Vec<i32>> = vec![vec![]; (n + 1) as usize];
+        for pair in conflicting_pairs.iter_mut() {
+            if pair[0] > pair[1] {
+                pair.swap(0, 1);
             }
-            if t == last {
-                continue;
-            }
-            last = t;
-            ans += t;
+            arr[pair[0] as usize].push(pair[1]);
         }
-        ans
+        let mut ans: i64 = 0;
+        let mut extra: Vec<i64> = vec![0; (n + 2) as usize];
+        let mut b: Vec<i64> = vec![(n + 1) as i64; (n + 1) as usize];
+        for i in (1..=n as usize).rev() {
+            b.extend(arr[i].iter().map(|&x| x as i64));
+            b.sort_unstable();
+            b.truncate(2);
+
+            ans += (b[0] as i64) - (i as i64);
+            extra[b[0] as usize] += b[1] - b[0];
+        }
+        ans + *extra.iter().max().unwrap() as i64
     }
 }
 
 fn main() {
-    let sl = Solution::max_sum(vec![-1,-2]);
+    let sl = Solution::max_subarrays(5, vec![vec![1, 2], vec![2, 5], vec![3, 5]]);
     println!("{}", sl);
 }
+