Submission #250930

#	Time	Username	Problem	Language	Result	Execution time	Memory
250930		imeimi2000	Secret (JOI14_secret)	C++17	100 / 100	538 ms	5624 KiB

secret

#include "secret.h"
#include <map>
 
using namespace std;
typedef pair<int, int> pii;
 
map<pii, int> mp;
map<pii, int>::iterator it;
int query(int x, int y) {
    if ((it = mp.find(pii(x, y))) != mp.end()) return it->second;
    return mp[pii(x, y)] = Secret(x, y);
}
 
int n;
int a[1000];
int pr[1000][10];
 
void dnc(int s, int e, int d = 0) {
    if (e - s < 2) return;
    int m = (s + e) / 2;
    int x;
    pr[m][d] = a[m];
    for (int i = m - 1; i >= s; --i) {
        pr[i][d] = query(a[i], pr[i + 1][d]);
    }
    pr[m + 1][d] = a[m + 1];
    for (int i = m + 2; i <= e; ++i) {
        pr[i][d] = query(pr[i - 1][d], a[i]);
    }
    dnc(s, m - 1, d + 1);
    dnc(m + 2, e, d + 1);
}
 
void Init(int N, int A[]) {
    n = N;
    for (int i = 0; i < n; ++i) {
        a[i] = A[i];
    }
    dnc(0, n - 1);
}
 
int getAns(int s, int e, int l, int r, int d = 0) {
    if (e - s < 2) throw 0;
    int m = (s + e) / 2;
    if (l <= m && m < r) return query(pr[l][d], pr[r][d]);
    if (l == m + 1) return pr[r][d];
    if (r == m) return pr[l][d];
    if (r < m) return getAns(s, m - 1, l, r, d + 1);
    if (m + 1 < l) return getAns(m + 2, e, l, r, d + 1);
    throw 0;
}
 
int Query(int L, int R) {
    if (R - L < 2) {
        if (L == R) return a[L];
        return query(a[L], a[R]);
    }
    return getAns(0, n - 1, L, R);
}

Compilation message (stderr)

secret.cpp: In function 'void dnc(int, int, int)':
secret.cpp:21:9: warning: unused variable 'x' [-Wunused-variable]
     int x;
         ^

• Subtask 1: 100 / 100