Submission #682514

#	Time	Username	Problem	Language	Result	Execution time	Memory
682514		vjudge1	Building 4 (JOI20_building4)	C++17	0 / 100	71 ms	95824 KiB

building4

#include <bits/stdc++.h>

#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")

using namespace std;

#define int long long
#define ll long long
#define vi vector<long long>
#define pb push_back
#define sz(s) (int)s.size()
#define all(v) v.begin(), v.end()
#define show(a) cerr << #a <<" -> "<< a <<"\n"
#define pp pair<int,int>
#define FF first
#define SS second
#define endl "\n"
#define ld long double

const int N = 1e6 + 2, N3 = 1e3 + 6, inf = 1e18 + 7, LOG = 20;
map<char, int> md{{'N', 0}, {'E', 1}, {'S', 2}, {'W', 3}};
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
string stepDir = "RDLU";

int n, a[N], b[N], dp[2001][2001], col[2001][2001];

main () {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

//	freopen(".in", "r", stdin);
//	freopen(".out", "w", stdout);

    cin >> n;
    for (int i = 1; i <= n * 2; i++) {
        cin >> a[i];
    }
    for (int i = 1; i <= n * 2; i++) {
        cin >> b[i];
    }

    for (int i = 0; i <= n * 2; i++) {
        for (int j = 0; j <= n; j++) {
            dp[i][j] = inf;
        }
    }

    dp[0][0] = 0;
    for (int i = 1; i <= n * 2; i++) {
        for (int j = 0; j <= min(i, n); j++) {
            if (j != 0 && a[i] >= dp[i - 1][j - 1]) {
                dp[i][j] = a[i];
                col[i][j] = 1;
            }
            if (b[i] >= dp[i - 1][j] && b[i] < dp[i][j]) {
                dp[i][j] = b[i];
                col[i][j] = 2;
            }
        }
    }

    vi v;
    int i = n * 2, j = n;
    while (i > 0) {
        if (dp[i][j] == inf) {
            cout << -1;
            return 0;
        }
        v.pb(col[i][j]);
        if (col[i][j] == 1) {
            j--;
        }
        i--;
    }
    reverse(all(v));
    for (auto to : v) {
        if (to == 1) cout << "A";
        else cout << "B";
    }

	return 0;
}

Compilation message (stderr)

building4.cpp:3: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    3 | #pragma comment(linker, "/stack:200000000")
      | 
building4.cpp:30:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   30 | main () {
      | ^~~~

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