Submission #682356

#	Time	Username	Problem	Language	Result	Execution time	Memory
682356		vjudge1	건물 4 (JOI20_building4)	C++17	11 / 100	280 ms	524288 KiB

building4

#include <bits/stdc++.h>
using namespace std;
#include <ext/rope>
using namespace __gnu_cxx;

// #pragma comment(linker, "/stack:2000000000")
// #pragma GCC optimize("Ofast")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")


typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;

#define precise(a) cout<<fixed<<setprecision(a)
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(), a.rend()
#define pb push_back
// t1
const ll mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353;  // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const ll N = ll(5e5)+10;
const ll K = 17;
const ll inf = 1e18;
const ld eps = 1e-15L;
//const ll B = 316;
ll lcm(ll a, ll b){ return (a / __gcd(a,b)) * b; }
//const ld P = acos(-1.0);

// ll binpow(ll a, ll b, ll m){ ll res=1;a%=m; while(b>0){ if(b&1)res=(res*a)%m; a=(a*a)%m; b/=2; } return res%m;}
ld binpow(ld a, ll b){ ld res=1; while(b>0){ if(b&1)res=(res*a); a=(a*a); b/=2; } return res;}


void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }


void precalc() {
}

void Baizho()
{   
	ll n; cin>>n;
	ll n1 = n*2;
	ll dp[n1+2][n1+2], a[n1+2], b[n1+2];
	for(ll i=1; i<=n1; i++) cin>>a[i];
	for(ll i=1; i<=n1; i++) cin>>b[i];
	for(ll i=0; i<=n1; i++) for(ll j=0; j<=n1; j++) dp[i][j] = inf;
	dp[0][0] = -1;
	ll did[n1+2][n1+2];
	for(ll i=1; i<=n1; i++) {
		for(ll j=0; j<=min(n-1, i-1); j++) {
			// getA
			ll A = j, B = i-1-j;
			if(dp[A][B]<=a[i]) {
				if(dp[A+1][B]>a[i]) did[A+1][B] = 0;
				dp[A+1][B] = min(dp[A+1][B], a[i]);
			}
			// getB
			A = i-1-j, B = j;
			if(dp[A][B]<=b[i]) {
				if(dp[A][B+1]>b[i]) did[A][B+1] = 1;
				dp[A][B+1] = min(dp[A][B+1], b[i]);
			}
		}
	}
	if(dp[n][n]==inf) cout<<"-1\n";
	else {
		ll i = n, j = n, anspos = n1;
		string ans;
		while(i || j) {
			// cout<<dp[i][j]<<" "<<i<<" "<<j<<endl;
			if(did[i][j]==0) {
				ans = "A" + ans;
				i--;
			}
			else {
				ans = "B" + ans;
				j--;
			}
			anspos--;
		}
		cout<<ans;
	}
	
}

    
int main() {

    // Freopen("div7");
    ios_base::sync_with_stdio(false);   
    cin.tie(0);cout.tie(0); 

    precalc();

    int ttt = 1;
    // cin>>ttt;

    for(int i=1; i<=ttt; i++) { Baizho();}
}

Compilation message (stderr)

building4.cpp: In function 'void Freopen(std::string)':
building4.cpp:37:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
building4.cpp:37:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 89