제출 #833765

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
833765		Ronin13	Railway Trip 2 (JOI22_ho_t4)	C++17	100 / 100	1836 ms	285948 KiB

Main

#include <bits/stdc++.h>
#define ll long long  
#define ull unsigned ll
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back
using namespace std;

const int nmax = 100001;
int mx[nmax][19][19];
int mn[nmax][19][19];

int get_mn(int l, int r, int ind){
    int x = r - l + 1;
    int u = log2(x);
    return min(mn[l][u][ind], mn[r - (1 << u) + 1][u][ind]);
}

int get_mx(int l, int r, int ind){
    int x = r - l + 1;
    int u = log2(x);
    return max(mx[l][u][ind], mx[r - (1 << u) + 1][u][ind]);
}



int main(){
    ios_base::sync_with_stdio(false); cin.tie(0);
    int n; cin >> n;
    int k; cin >> k;
    int m; cin >> m;
    int a[m + 1], b[m + 1];
    for(int i = 1; i <= n; i++){
        for(int j = 0; j < 19; j++){
            for(int x = 0; x < 19; x++)
                mx[i][j][x] = -1e9, mn[i][j][x] = 1e9;
        }
    }
    for(int i = 1; i <= m; i++){
        int a, b; cin >> a >> b;
        if(a < b){
            mx[a][0][18] = max(mx[a][0][18], b);
        }
        if(a > b){
            mn[a][0][18] = min(mn[a][0][18], b);
        }
    }
    for(int i = 1; i < 19; i++){
        for(int j = 1; j <= n; j++){
            int R = min(j + (1 << (i - 1)), n);
            mn[j][i][18] = min(mn[j][i - 1][18], mn[R][i - 1][18]);
            mx[j][i][18] = max(mx[j][i - 1][18], mx[R][i - 1][18]);
        } 
    }
    for(int i = 1; i <= n; i++){
       mn[i][0][0] = get_mn(i, min(n, i + k - 1), 18);
        mx[i][0][0] = get_mx(max(i - k + 1, 1), i, 18);
        mn[i][0][0] = min(mn[i][0][0], i);
        mx[i][0][0] = max(mx[i][0][0], i);
    }

    for(int i = 1; i < 19; i++){
        for(int j = 1; j <= n; j++){
            int R = min(j + (1 << (i - 1)), n);
            mn[j][i][0] = min(mn[j][i - 1][0], mn[R][i - 1][0]);
            mx[j][i][0] = max(mx[j][i - 1][0], mx[R][i - 1][0]);
        } 
    }
    for(int i = 1; i < 18; i++){
        for(int j = 1; j <= n; j++){
            int L = mn[j][0][i - 1], R = mx[j][0][i - 1];
            mn[j][0][i] = get_mn(L, R, i - 1);
            mx[j][0][i] = get_mx(L, R, i - 1);
        }
        for(int x = 1; x < 19; x++){
            for(int j = 1; j <= n; j++){
                int  R= min(j + (1 << (x - 1)), n);
                mn[j][x][i] = min(mn[j][x - 1][i], mn[R][x - 1][i]);
                mx[j][x][i] = max(mx[j][x - 1][i], mx[R][x - 1][i]);
            }
        }
    }

   // cout << get_mx(3, 9, 0);
    int q; cin >> q;
    while(q--){
        int a, b; cin >> a >> b;
        int L = a, R = a;
        int ans = 0;
        for(int j = 17; j >= 0; j--){
            int l = get_mn(L, R, j);
            int r = get_mx(L, R, j);
            //cout << l << ' ' << r << "\n";
            if(l <= b && r >= b) continue;
            L = l, R = r;
           //cout << l << ' ' << r << ' ' << j << "\n";
            ans += (1 << j);
        }
        if(ans > (1 << 17)) cout << -1 << "\n";
        else cout << ans + 1 << "\n";
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:35:9: warning: unused variable 'a' [-Wunused-variable]
   35 |     int a[m + 1], b[m + 1];
      |         ^
Main.cpp:35:19: warning: unused variable 'b' [-Wunused-variable]
   35 |     int a[m + 1], b[m + 1];
      |                   ^

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 11 / 11
• Subtask 4: 25 / 25
• Subtask 5: 35 / 35
• Subtask 6: 13 / 13