Submission #29886636

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Source Code Expand

/*
他决定要“格”院子里的竹子。于是他搬了一条凳子坐在院子里，面对着竹子硬想了七天，结果因为头痛而宣告失败。
DONT NEVER AROUND . //
*/
#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
const LL MOD=998244353;
LL n,pw[1000005];
char s[1000005];
LL QuickPow(LL x,LL p)
{
	if(p<0)	p+=MOD-1;
	LL ans=1,base=x;
	while(p)
	{
		if(p&1)	ans=ans*base%MOD;
		base=base*base%MOD;
		p>>=1;
	}
	return ans;
}
void Solve()
{
	scanf("%lld",&n);
	scanf("%s",s+1);
	LL ans=0;
	LL mid=(n+1)/2;
	for(LL i=1;i<=mid;++i)	ans=(ans+pw[mid-i]*(s[i]-'A')%MOD)%MOD;
	for(LL i=mid;i;--i)
	{
		if(s[i]<s[n-i+1])
		{
			ans=(ans+1)%MOD;
			goto fail;
		}
		if(s[i]>s[n-i+1])	goto fail;
	}
	ans=(ans+1)%MOD;
	fail:;
	printf("%lld\n",ans);
}
int main(){
	pw[0]=1;
	for(LL i=1;i<=1000000;++i)	pw[i]=pw[i-1]*26%MOD;
	LL T;
	scanf("%lld",&T);
	while(T-->0)	Solve();
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void Solve()’:
./Main.cpp:25:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   25 |  scanf("%lld",&n);
      |  ~~~~~^~~~~~~~~~~
./Main.cpp:26:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   26 |  scanf("%s",s+1);
      |  ~~~~~^~~~~~~~~~
./Main.cpp: In function ‘int main()’:
./Main.cpp:47:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   47 |  scanf("%lld",&T);
      |  ~~~~~^~~~~~~~~~~

Judge Result