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feat: add rust solution to lc problem: No.2475 #1337

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Merged
merged 1 commit into from
Jul 29, 2023
Merged

feat: add rust solution to lc problem: No.2475 #1337

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66 changes: 66 additions & 0 deletions solution/2400-2499/2475.Number of Unequal Triplets in Array/README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -385,6 +385,72 @@ impl Solution {
}
```

```rust
use std::collections::HashMap;

impl Solution {
pub fn unequal_triplets(nums: Vec<i32>) -> i32 {
let cnt = nums.iter().fold(HashMap::new(), |mut map, &n| {
*map.entry(n).or_insert(0) += 1;
map
});

let mut ans = 0;
let n = nums.len();
let mut a = 0;
for &b in cnt.values() {
let c = n - a - b;
ans += a * b * c;
a += b;
}

ans as i32
}
}
```

```rust
impl Solution {
pub fn unequal_triplets(nums: Vec<i32>) -> i32 {
let mut ans = 0;
let mut nums = nums;
nums.sort();
let n = nums.len();

for i in 1..n - 1 {

let mut l = 0;
let mut r = i;
while l < r {
let mid = (l + r) >> 1;
if nums[mid] >= nums[i] {
r = mid;
} else {
l = mid + 1;
}
}
let j = r;

let mut l = i + 1;
let mut r = n;
while l < r {
let mid = (l + r) >> 1;
if nums[mid] > nums[i] {
r = mid;
} else {
l = mid + 1;
}
}
let k = r;

ans += j * (n - k)
}

ans as i32
}
}
```

### **...**

```
Expand Down
66 changes: 66 additions & 0 deletions solution/2400-2499/2475.Number of Unequal Triplets in Array/README_EN.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -353,6 +353,72 @@ impl Solution {
}
```

```rust
use std::collections::HashMap;

impl Solution {
pub fn unequal_triplets(nums: Vec<i32>) -> i32 {
let cnt = nums.iter().fold(HashMap::new(), |mut map, &n| {
*map.entry(n).or_insert(0) += 1;
map
});

let mut ans = 0;
let n = nums.len();
let mut a = 0;
for &b in cnt.values() {
let c = n - a - b;
ans += a * b * c;
a += b;
}

ans as i32
}
}
```

```rust
impl Solution {
pub fn unequal_triplets(nums: Vec<i32>) -> i32 {
let mut ans = 0;
let mut nums = nums;
nums.sort();
let n = nums.len();

for i in 1..n - 1 {

let mut l = 0;
let mut r = i;
while l < r {
let mid = (l + r) >> 1;
if nums[mid] >= nums[i] {
r = mid;
} else {
l = mid + 1;
}
}
let j = r;

let mut l = i + 1;
let mut r = n;
while l < r {
let mid = (l + r) >> 1;
if nums[mid] > nums[i] {
r = mid;
} else {
l = mid + 1;
}
}
let k = r;

ans += j * (n - k)
}

ans as i32
}
}
```

### **...**

```
Expand Down