| Task: | Sorting |
| Sender: | kostia244 |
| Submission time: | 2021-01-30 17:13:54 +0200 |
| Language: | C++ (C++17) |
| Status: | READY |
| Result: | 0 |
| group | verdict | score |
|---|---|---|
| #1 | WRONG ANSWER | 0 |
| #2 | WRONG ANSWER | 0 |
| test | verdict | time | group | |
|---|---|---|---|---|
| #1 | WRONG ANSWER | 0.01 s | 1, 2 | details |
| #2 | WRONG ANSWER | 0.01 s | 2 | details |
| #3 | ACCEPTED | 0.01 s | 1, 2 | details |
| #4 | ACCEPTED | 0.01 s | 1, 2 | details |
Compiler report
input/code.cpp: In member function 'void fen::add(int)':
input/code.cpp:9:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(; pos < a.size(); pos += pos&-pos) a[pos]++;
~~~~^~~~~~~~~~Code
#include<bits/stdc++.h>
#define all(x) x.begin(), x.end()
using namespace std;
using ll = long long;
struct fen {
vector<int> a;
fen(int n) : a(n+1) {}
void add(int pos) {
for(; pos < a.size(); pos += pos&-pos) a[pos]++;
}
int get(int pos) {
int res = 0;
for(; pos; pos -= pos&-pos) res += a[pos];
return res;
}
};
int main() {
cin.tie(0)->sync_with_stdio(0);
int t;
cin >> t;
while(t--) {
int n;
cin >>n;
vector<int> a(n);
fen f(n);
ll inv = 0;
for(auto &i : a) {
cin >> i;
inv += f.get(i);
f.add(i);
};
inv = n*1ll*(n-1)/2 - inv;
if(n < 4) {
inv = inv != 0;
}
if(n == 4) {
inv = inv != 0 && inv != 2;
}
cout << (inv%2?"NO":"YES") << '\n';
}
}
Test details
Test 1
Group: 1, 2
Verdict: WRONG ANSWER
| input |
|---|
| 153 1 1 2 1 2 ... |
| correct output |
|---|
| YES YES NO NO NO ... |
| user output |
|---|
| YES YES NO NO NO ... Truncated |
Test 2
Group: 2
Verdict: WRONG ANSWER
| input |
|---|
| 1000 59 35 29 32 50 11 15 9 21 19 45 2... |
| correct output |
|---|
| YES NO YES NO YES ... |
| user output |
|---|
| YES NO YES NO YES ... Truncated |
Test 3
Group: 1, 2
Verdict: ACCEPTED
| input |
|---|
| 720 6 1 6 4 5 2 3 6 6 3 2 1 5 4 ... |
| correct output |
|---|
| YES NO NO NO YES ... |
| user output |
|---|
| YES NO NO NO YES ... Truncated |
Test 4
Group: 1, 2
Verdict: ACCEPTED
| input |
|---|
| 1000 8 7 4 2 8 6 3 5 1 8 3 8 2 7 5 4 6 1 ... |
| correct output |
|---|
| NO NO YES NO YES ... |
| user output |
|---|
| NO NO YES NO YES ... Truncated |