Submission #38709544

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Source Code Expand

#include<bits/stdc++.h>
#define LL long long
#define MOD 1000000007
using namespace std;
int inc(const int &a, const int &b)
{
    return a + b >= MOD ? a + b - MOD : a + b;
}
void Mul(int &a, const int &b)
{
    a = 1LL * a * b % MOD;
}
void Sqr(int &a)
{
    a = 1LL * a * a % MOD;
}
int qwqmi(int x, int k = MOD - 2)
{
    int res = 1;
    while(k)
    {
        if(k & 1) Mul(res, x);
        Sqr(x), k >>= 1;
    }
    return res;
}
const int N = 1e3 + 5;
int n, ans, f[N];
char c[2][2];
int main()
{
    scanf("%d", &n);
    scanf(" %c", &c[0][0]);
    scanf(" %c", &c[0][1]);
    scanf(" %c", &c[1][0]);
    scanf(" %c", &c[1][1]);
    if(n == 2)
    {
        puts("1");
        return 0;
    }
    f[0] = 1;
    f[1] = 2;
    for(int i = 2; i < N; ++i)
        f[i] = inc(f[i - 1], f[i - 2]);
    if(c[0][1] == 'A')
    {
        if(c[0][0] == 'A')
            ans = 1;
        else
        {
            if(c[1][0] == 'B')
                ans = qwqmi(2, n - 3);
            else
                ans = f[n - 3];
        }
    }
    if(c[0][1] == 'B')
    {
        if(c[1][1] == 'B')
            ans = 1;
        else
        {
            if(c[1][0] == 'A')
                ans = qwqmi(2, n - 3);
            else
                ans = f[n - 3];
        }
    }
    printf("%d\n", ans);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:32:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   32 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
./Main.cpp:33:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   33 |     scanf(" %c", &c[0][0]);
      |     ~~~~~^~~~~~~~~~~~~~~~~
./Main.cpp:34:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   34 |     scanf(" %c", &c[0][1]);
      |     ~~~~~^~~~~~~~~~~~~~~~~
./Main.cpp:35:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   35 |     scanf(" %c", &c[1][0]);
      |     ~~~~~^~~~~~~~~~~~~~~~~
./Main.cpp:36:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   36 |     scanf(" %c", &c[1][1]);
      |     ~~~~~^~~~~~~~~~~~~~~~~

Judge Result