Submission #92376

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
92376	2019-01-02 16:58:01	Alexa2001	Snake Escaping (JOI18_snake_escaping)	C++17	100 / 100	1048 ms	47284 KiB

snake_escaping

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#include <bits/stdc++.h>
using namespace std;
const int Nmax = (1<<20);
int n, q;
char S[Nmax+2], Val[Nmax+2];
int val[Nmax], up[Nmax], down[Nmax], bits[Nmax];
void precalc()
{
    int i, j;
    for(i=0; i<(1<<n); ++i)
        bits[i] = __builtin_popcount(i), up[i] = down[i] = val[i] = Val[i] - '0';
    for(i=0; i<n; ++i)
        for(j=0; j<(1<<n); ++j)
            if(j & (1<<i))
                up[j ^ (1<<i)] += up[j];
            else down[j ^ (1<<i)] += down[j];
}
int solveQ(int mask, int que)
{
    int i, j, ans = 0;
    for(i=que, j = 0; j < (1<<bits[que]); i = (i-1) & que, ++j)
        ans += val[i ^ mask];
    return ans;
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

snake_escaping.cpp: In function 'int query()':
snake_escaping.cpp:52:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s\n", S);
     ~~~~~^~~~~~~~~~~
snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:73:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d\n", &n, &q);
     ~~~~~^~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:74:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s\n", Val);
     ~~~~~^~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 10 / 10
• Subtask 4: 53 / 53
• Subtask 5: 25 / 25