Submission #201714

#	Time	Username	Problem	Language	Result	Execution time	Memory
201714		stefdasca	Snake (CEOI08_snake)	C++14	5 / 100	5 ms	504 KiB

snake

#include "snakelib.h"
#include<bits/stdc++.h>
using namespace std;
int k, minlen;
char x, y;
void casework(int &st, int &dr, int mid1, int mid2)
{
    if(x == 's' && y == 's')
    {
        minlen = max(minlen, mid2 - mid1);
        st = (st + mid1) / 2;
        dr = (dr + mid2) / 2 + k;
    }
    if(x == 's' && y == 'f')
    {
        st = (st + mid1) / 2 - k;
        dr = mid2 + k;
    }
    if(x == 'b' && y == 'b')
        st = mid1;
    if(x == 'f' && y == 'f')
        dr = mid1 + k;
    if(x == 'b' && y == 'f')
    {
        st = mid1;
        dr = mid2 + k;
    }
    if(x == 'b' && y == 's')
    {
        st = mid1;
        dr = (dr + mid2) / 2 + k;
    }
}
int main()
{
    k = get_speed();
    int st = 0;
    int dr = 12121;
    int qu = 13;
    minlen = 0;
    while(qu)
    {
        int mid1 = st + (dr - st) / 3;
        int mid2 = dr - (dr - st) / 3;
        ask_snake(mid1, mid2, &x, &y);
        --qu;
        if(x == 's' && y == 's')
        {
            while(qu && x == 's' && y == 's')
            {
                minlen = max(minlen, mid2 - mid1);
                mid1 = (st + mid1) / 2;
                mid2 = (dr + mid2) / 2 + k;
                ask_snake(mid1, mid2, &x, &y);
                --qu;
            }
            casework(st, dr, mid1, mid2);
        }
        else
            casework(st, dr, mid1, mid2);
    }
    if(minlen == 0)
        tell_length(minlen);
    else
        tell_length(dr - st);
}

• Subtask 1: 5 / 100