This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define F first
#define S second
#define mp make_pair
#define pb push_back
//#define ll __int128
#define ll long long
#define int long long
#define LEFT(a) ((a)<<1)
#define RIGHT(a) (LEFT(a) + 1)
#define MID(a,b) ((a+b)>>1)
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)<(b)?(a):(b))
#define y1 y122
/*
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
/*
#pragma GCC optimize ("O3")
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2,fma")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC target ("avx2")
#pragma GCC optimization ("unroll-loops")
#pragma comment(linker, "/STACK: 20000000005")
*/
using namespace std;
const int N = 200005;
int n, F[N];
void upd (int x){
for (; x <= n; x += x & -x)
F[x]++;
}
int dat (int x){
int ans = 0;
for (; x > 0; x &= x-1)
ans += F[x];
return ans;
}
int ans;
vector < int > V[N];
priority_queue < int > Q;
main()
{
//freopen ("in.in", "r", stdin);freopen ("out.out", "w", stdout);
ios_base::sync_with_stdio(0);
cin >> n;
for (int x, i = 1; i <= n; i++){
cin >> x;
V[x].pb (i);
}
for (int i = 1; i <= n; i++){
for (int x : V[i])
Q.push (-x);
if (Q.size() == 0){
cout << -1 << endl;
return 0;
}
int x = -Q.top();
Q.pop();
ans += dat (x);
upd (x);
}
cout << ans << endl;
}
Compilation message (stderr)
Main.cpp:19:1: warning: "/*" within comment [-Wcomment]
19 | /*
|
Main.cpp:54:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
54 | main()
| ^
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