Submission #172319

#	Time	Username	Problem	Language	Result	Execution time	Memory
172319		ho94949	Abduction 2 (JOI17_abduction2)	C++17	27 / 100	199 ms	65028 KiB

abduction2

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

enum {UP, LEFT, DOWN, RIGHT};
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, -1, 0, 1};
const int MAXN = 2020;
int H, W, Q;
int A[MAXN], B[MAXN];
int dp[MAXN][MAXN][4];
bool ins(int x, int y){ return 0<=x&&x<H&&0<=y&&y<W; }
int solve(int x, int y, int d)
{
    if(dp[x][y][d] != -1) return dp[x][y][d];
    
    int nx = x+dx[d], ny = y+dy[d];
    if(!ins(nx, ny)) return dp[x][y][d] = 0;

    if(d==UP||d==DOWN)
    {
        if(A[nx]<B[ny]) return dp[x][y][d] = 1+solve(nx, ny, d);
        else return dp[x][y][d] = 1+max(solve(nx, ny, LEFT), solve(nx, ny, RIGHT));
    }
    else
    {
        if(B[ny]<A[nx]) return dp[x][y][d] = 1+solve(nx, ny, d);
        else return dp[x][y][d] = 1+max(solve(nx, ny, UP), solve(nx, ny, DOWN));
    }
}
int main()
{
    memset(dp, -1, sizeof dp);
    scanf("%d%d%d", &H, &W, &Q);
    for(int i=0; i<H; ++i)
        scanf("%d", A+i);
    for(int i=0; i<W; ++i)
        scanf("%d", B+i);
    while(Q--)
    {
        int S, T; scanf("%d%d", &S, &T); --S; --T;
        int ans = 0;
        for(int d=0; d<4; ++d)
            ans = max(ans, solve(S, T, d));
        printf("%d\n", ans);
    }
}

Compilation message (stderr)

abduction2.cpp: In function 'int main()':
abduction2.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &H, &W, &Q);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
abduction2.cpp:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", A+i);
         ~~~~~^~~~~~~~~~~
abduction2.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", B+i);
         ~~~~~^~~~~~~~~~~
abduction2.cpp:40:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int S, T; scanf("%d%d", &S, &T); --S; --T;
                   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 10 / 10
• Subtask 3: 0 / 17
• Subtask 4: 4 / 4
• Subtask 5: 0 / 56