提出 #68195615

---

ソースコード 拡げる

#include<stdio.h>
// inline char nc()
// {
// 	static char*l,*r,buf[99999];
// 	return l==r&&(r=(l=buf)+fread(buf,1,99999,stdin),l==r)?EOF:*l++;
// }
#define nc getchar
inline void read(int&x)
{
	char c=nc();for(;c<'0'||'9'<c;c=nc());
	for(x=0;'0'<=c&&c<='9';x=(x<<3)+(x<<1)+(c^48),c=nc());
}
int n,q,a[200009],b[200009],c[200009],cnt0,cnt1,cnt00,cnt11,org1;
inline void upd(int i)
{
	if(b[i]==c[i])return;
	if(c[i])--cnt1;else--cnt0;
	if(i)if(c[i]==c[i-1])if(c[i])--cnt11;else--cnt00;
	if(i<n-1)if(c[i]==c[i+1])if(c[i])--cnt11;else--cnt00;
	c[i]=b[i];
	if(c[i])++cnt1;else++cnt0;
	if(i)if(c[i]==c[i-1])if(c[i])++cnt11;else++cnt00;
	if(i<n-1)if(c[i]==c[i+1])if(c[i])++cnt11;else++cnt00;
}
inline bool sp0(int i)
{
	if(i<=0)return 0;
	if(i>=n-1)return 0;
	return!a[i]&&a[i-1]&&a[i+1];
}
main()
{
	read(n);for(int i=0;i<n;read(a[i]),b[i]=a[i],org1+=a[i++]);
	for(int i=1;i<n-1;++i)if(sp0(i))b[i]=1;
	for(int i=0;i<n;c[i]=b[i],++i);
	for(int i=0;i<n;++i)if(b[i])++cnt1;else++cnt0;
	for(int i=1;i<n;++i)if(b[i]==b[i-1])if(b[i])++cnt11;else++cnt00;
	read(q);
	for(int i;q--;)
	{
		read(i);--i;
		if(i)b[i-1]=a[i-1],upd(i-1);
		org1-=a[i];
		b[i]=a[i]^=1,upd(i);
		org1+=a[i];
		if(i<n-1)b[i+1]=a[i+1],upd(i+1);
		if(sp0(i-1))b[i-1]=1,upd(i-1);
		if(sp0(i))b[i]=1,upd(i);
		if(sp0(i+1))b[i+1]=1,upd(i+1);
		if(cnt1==n){printf("%d\n",org1==n?n:2);continue;}
		int tmp0=cnt0-cnt00<<1,tmp1=cnt1-cnt11;
		if(!a[0])if(a[1])--tmp0;
		if(!a[n-1])if(a[n-2])--tmp0;
		printf("%d\n",tmp0+tmp1);
	}
}

提出情報

コンパイルエラー

Main.cpp: In function ‘void upd(int)’:
Main.cpp:18:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   18 |         if(i)if(c[i]==c[i-1])if(c[i])--cnt11;else--cnt00;
      |                ^
Main.cpp:19:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   19 |         if(i<n-1)if(c[i]==c[i+1])if(c[i])--cnt11;else--cnt00;
      |                    ^
Main.cpp:22:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   22 |         if(i)if(c[i]==c[i-1])if(c[i])++cnt11;else++cnt00;
      |                ^
Main.cpp:23:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   23 |         if(i<n-1)if(c[i]==c[i+1])if(c[i])++cnt11;else++cnt00;
      |                    ^
Main.cpp: At global scope:
Main.cpp:31:1: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type]
   31 | main()
      | ^~~~
Main.cpp: In function ‘int main()’:
Main.cpp:37:31: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   37 |         for(int i=1;i<n;++i)if(b[i]==b[i-1])if(b[i])++cnt11;else++cnt00;
      |                               ^
Main.cpp:51:30: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses]
   51 |                 int tmp0=cnt0-cnt00<<1,tmp1=cnt1-cnt11;
      |                          ~~~~^~~~~~

ジャッジ結果