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#396. 种胡萝卜

https://sjzezoj.com/submission/58962
This commit is contained in:
Baoshuo Ren 2022-10-01 20:25:37 +08:00
parent eecfe2dbac
commit 0968dea630
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
24 changed files with 120 additions and 0 deletions

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// ios::sync_with_stdio(0);
// cin.tie(nullptr);cout.tie(nullptr);
// int n,m,ans=0;cin>>m>>n;
// for (int i=1;i<=n;i++) fa[i]=i;
// for (int i=1;i<=m;i++){
// int x;cin>>x;int pos=find(x);
// merge(pos,pos-1);(ans+=pos*i)%=mod;
// }cout<<ans;return 0;
#include <iostream>
#include <numeric>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 3000000;
const int mod = 1e9 + 7;
int n, m, fa[N], ans;
int find(int x) {
return fa[x] == x ? x : fa[x] = find(fa[x]);
}
void merge(int x, int y) {
fa[find(x)] = find(y);
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
std::iota(fa + 1, fa + m + 1, 1);
for (int i = 1, x; i <= n; i++) {
cin >> x;
int p = find(x);
merge(p, p - 1);
ans = (ans + static_cast<long long>(p) * i) % mod;
}
cout << ans << endl;
return 0;
}

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