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3583. 统计特殊三元组

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li_chx 2025-12-10 15:49:39 +08:00
parent 376065acb6
commit 9a82ec82f7
Signed by: li_chx
GPG Key ID: 70D4985BB8180E92
1 changed files with 19 additions and 8 deletions
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src/main.rs
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@ -1,19 +1,30 @@
use std::collections::HashMap;
struct Solution; struct Solution;
mod arr; mod arr;
impl Solution { impl Solution {
pub fn count_permutations(complexity: Vec<i32>) -> i32 { pub fn special_triplets(nums: Vec<i32>) -> i32 {
let md= 1e9 as i64 + 7; let mut map: HashMap<i32, i32> = HashMap::new();
let mut ans = 1_i64; let mut map2: HashMap<i32, i32> = HashMap::new();
for i in 1..complexity.len() { let md = 1e9 as i64 + 7;
if complexity[i] <= complexity[0] { let mut ans = 0_i64;
return 0; nums.iter().for_each(|x| {
map.insert(*x, map.get(&x).copied().unwrap_or(0) + 1);
});
map2.insert(nums[0], 1);
for i in 1..nums.len() - 1 {
let mp2d = map2.get(&(nums[i] * 2)).copied().unwrap_or(0) as i64;
let mut mp1d = map.get(&(nums[i] * 2)).copied().unwrap_or(0) as i64 - mp2d;
if nums[i] == nums[i] * 2 {
mp1d -= 1;
} }
ans = (ans * i as i64) % md; ans = (ans + mp1d * mp2d) % md;
map2.insert(nums[i], map2.get(&nums[i]).copied().unwrap_or(0) + 1);
} }
ans as i32 ans as i32
} }
} }
fn main() { fn main() {
let result = Solution::count_permutations(vec![1, 3, 3, 4, 4, 4]); let result = Solution::special_triplets(vec![0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]);
println!("{:?}", result); println!("{:?}", result);
} }