Submission #1021549

#	Time	Username	Problem	Language	Result	Execution time	Memory
1021549		Shadxwed	Awesome Arrowland Adventure (eJOI19_adventure)	C11	50 / 100	2033 ms	1880 KiB

adventure

#include <stdio.h>
#include <stdlib.h>

const int inf = 500*500*3+2;

void f(char *arr, int *res, int posy, int posx, int maxx) {
    static int t;
    static char t2;
    int t3 = res[(posy-1)*maxx+posx-1];
    if(arr[posy*(maxx+2)+posx+1] != 'X') {
        t = res[(posy-1)*maxx+posx];
        t2 = arr[posy*(maxx+2)+posx+1];
        if(t2 == 'W' && t3 < t) {
            res[(posy-1)*maxx+posx] = t3;
            f(arr, res, posy, posx+1, maxx);
        } else if(t2 == 'N' && t3+3 < t) {
            res[(posy-1)*maxx+posx] = t3+3;
            f(arr, res, posy, posx+1, maxx);
        } else if(t2 == 'E' && t3+2 < t) {
            res[(posy-1)*maxx+posx] = t3+2;
            f(arr, res, posy, posx+1, maxx);
        } else if(t2 == 'S' && t3+1 < t) {
            res[(posy-1)*maxx+posx] = t3+1;
            f(arr, res, posy, posx+1, maxx);
        }
    }
    if(arr[posy*(maxx+2)+posx-1] != 'X') {
        t = res[(posy-1)*maxx+posx-2];
        t2 = arr[posy*(maxx+2)+posx-1];
        if(t2 == 'E' && t3 < t) {
            res[(posy-1)*maxx+posx-2] = t3;
            f(arr, res, posy, posx-1, maxx);
        } else if(t2 == 'S' && t3+3 < t) {
            res[(posy-1)*maxx+posx-2] = t3+3;
            f(arr, res, posy, posx-1, maxx);
        } else if(t2 == 'W' && t3+2 < t) {
            res[(posy-1)*maxx+posx-2] = t3+2;
            f(arr, res, posy, posx-1, maxx);
        } else if(t2 == 'N' && t3+1 < t) {
            res[(posy-1)*maxx+posx-2] = t3+1;
            f(arr, res, posy, posx-1, maxx);
        }
    }
    if(arr[(posy+1)*(maxx+2)+posx] != 'X') {
        t = res[posy*maxx+posx-1];
        t2 = arr[(posy+1)*(maxx+2)+posx];
        if(t2== 'N' && t3 < t) {
            res[posy*maxx+posx-1] = t3;
            f(arr, res, posy+1, posx, maxx);
        } else if(t2 == 'E' && t3+3 < t) {
            res[posy*maxx+posx-1] = t3+3;
            f(arr, res, posy+1, posx, maxx);
        } else if(t2 == 'S' && t3+2 < t) {
            res[posy*maxx+posx-1] = t3+2;
            f(arr, res, posy+1, posx, maxx);
        } else if(t2 == 'W' && t3+1 < t) {
            res[posy*maxx+posx-1] = t3+1;
            f(arr, res, posy+1, posx, maxx);
        }
    }
    if(arr[(posy-1)*(maxx+2)+posx] != 'X') {
        t = res[(posy-2)*maxx+posx-1];
        t2 = arr[(posy-1)*(maxx+2)+posx];
        if(t2 == 'S' && t3 < t) {
            res[(posy-2)*maxx+posx-1] = t3;
            f(arr, res, posy-1, posx, maxx);
        } else if(t2 == 'W' && t3+3 < t) {
            res[(posy-2)*maxx+posx-1] = t3+3;
            f(arr, res, posy-1, posx, maxx);
        } else if(t2 == 'N' && t3+2 < t) {
            res[(posy-2)*maxx+posx-1] = t3+2;
            f(arr, res, posy-1, posx, maxx);
        } else if(t2 == 'E' && t3+1 < t) {
            res[(posy-2)*maxx+posx-1] = t3+1;
            f(arr, res, posy-1, posx, maxx);
        }
    }
}

int main()
{
    int n, m;
    scanf("%d %d ", &n, &m);
    char *arr = malloc((n+2)*(m+2)*sizeof(char));
    int *res = malloc(n*m*sizeof(int));
    for(int i = 1; i < n+1; i++) {
        for(int j = 1; j < m+1; j++) {
            scanf("%c", &arr[i * (m+2) + j]);
        }
        if(i+1<n+1) scanf(" ");
    }
    for(int i = 0; i < n+2; i++) {
        arr[0*(m+2)+i] = 'X';
        arr[i*(m+2)+0] = 'X';
        arr[((n+2)-1)*(m+2)+i] = 'X';
        arr[i*(m+2)+(m+2)-1] = 'X';
    }
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            res[i*m+j] = inf;
        }
    }

    res[(n-1)*m+m-1] = 0;
    f(arr, res, n, m, m);
    n = res[0*m+0];
    printf("%d", n<inf?n:-1); //res
    free(arr);
    free(res);
    return 0;
}

Compilation message (stderr)

adventure.c: In function 'main':
adventure.c:83:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |     scanf("%d %d ", &n, &m);
      |     ^~~~~~~~~~~~~~~~~~~~~~~
adventure.c:88:13: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |             scanf("%c", &arr[i * (m+2) + j]);
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
adventure.c:90:21: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         if(i+1<n+1) scanf(" ");
      |                     ^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 16 / 16
• Subtask 5: 0 / 50