이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vb = vector<bool>;
using vvb = vector<vb>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vc = vector<char>;
using vvc = vector<vc>;
using vs = vector<string>;
const ll mod = 1e9 + 7,inf = 1e18;
#define pb push_back
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
void setIO()
{
fast;
}
int main()
{
setIO();
int n;
cin>>n;
int m = 2 * n;
vi a(m + 1),b(m + 1);
for (int i = 1;i<=m;i++)cin>>a[i];for (int i = 1;i<=m;i++)cin>>b[i];
vvi l(m + 1,vi(2,1e9)),h(m + 1,vi(2,-1e9));
l[0][0] = l[0][1] = h[0][0] = h[0][1] = 0;
for (int i = 1;i<=m;i++){
if (a[i] >= a[i - 1])
l[i][0] = min(l[i][0],l[i - 1][0] + 1),
h[i][0] = max(h[i][0],h[i - 1][0] + 1);
if (a[i] >= b[i - 1])
l[i][0] = min(l[i][0],l[i - 1][1] + 1),
h[i][0] = max(h[i][0],h[i - 1][1] + 1);
if (b[i] >= a[i - 1])
l[i][1] = min(l[i][1],l[i - 1][0]),
h[i][1] = max(h[i][1],h[i - 1][0]);
if (b[i] >= b[i - 1])
l[i][1] = min(l[i][1],l[i - 1][1]),
h[i][1] = max(h[i][1],h[i - 1][1]);
}
int i = m;
if (l[i][0] <= n && n <= h[i][0]){
vi out;
int choice = 0;
int numReq = n;
while (i >= 1){
out.pb(choice);
if (choice == 0)numReq--;
bool is = (choice == 0 ? a[i] >= a[i - 1] : b[i] >= a[i - 1]);
if (l[i - 1][0] <= numReq && numReq <= h[i - 1][0] && is)
choice = 0;
else
choice = 1;
i--;
}
reverse(out.begin(),out.end());
for(auto it:out)cout<<(it ? "B" : "A");
}
else if (l[i][1] <= n && n <= h[i][1]){
vi out;
out.pb(1);
int choice = 1;
int numReq = n;
while (i >= 1){
out.pb(choice);
if (choice == 0)numReq--;
bool is = (choice == 0 ? a[i] >= a[i - 1] : b[i] >= a[i - 1]);
if (l[i - 1][0] <= numReq && numReq <= h[i - 1][0] && is)
choice = 0;
else
choice = 1;
i--;
}
reverse(out.begin(),out.end());
for (auto it:out)cout<<(it == 0 ? "A" : "B");
}
else{
cout<<-1;
}
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
building4.cpp: In function 'int main()':
building4.cpp:27:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
27 | for (int i = 1;i<=m;i++)cin>>a[i];for (int i = 1;i<=m;i++)cin>>b[i];
| ^~~
building4.cpp:27:39: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
27 | for (int i = 1;i<=m;i++)cin>>a[i];for (int i = 1;i<=m;i++)cin>>b[i];
| ^~~
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