分块求调+1，咦感谢您

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
using namespace std;
const int N=100050;
int T;
int n,k;
int a[N];
char pd;
int l,v,r,zfs,zls;
bool lflag=0,cflag=0;
int fs[10001],ls[10001];
int main(){
	//freopen("inter.in","r",stdin);
	//freopen("inter.out","w",stdout);
	while(cin>>n>>k){
		memset(fs,0,sizeof(fs));
		memset(ls,0,sizeof(ls));
		for(int i=1;i<=n;i++){
			scanf("%d",&a[i]);
		}
		for(int i=0;i<=n/100;i++){
			for(int j=0;j<=99;j++){
				if(i*100+j==0)continue;
				if((i*100+j)>n)break;
				if(a[i*100+j]<0){
					fs[i]++;
				}else if(a[i*100+j]==0){
					ls[i]++;
				}
			}
		}
		for(int q=1;q<=k;q++){
			cin>>pd;
			if(pd=='C'){
				cin>>l>>v;
				if(v<0){
					if(a[l]==0){
						ls[l/100]--;
						fs[l/100]++;
					}else if(a[l]>0){
						fs[l/100]++;
					}
				}else if(v==0){
					if(a[l]<0){
						fs[l/100]--;
						ls[l/100]++;
					}else if(a[l]>0){
						ls[l/100]++;
					}
				}else{
					if(a[l]<0){
						fs[l/100]--;
					}else if(a[l]==0){
						ls[l/100]--;
					}
				}
				a[l]=v;
			}if(pd=='P'){
				zfs=0;zls=0;
				lflag=0;
				cflag=0;
				cin>>l>>r;
				if(l%100!=0){
					for(int i=l;i<(l/100+1)*100;i++){
						if(r<i){
							cflag=1;
							break;
						}
						if(a[i]<0)zfs++;
						if(a[i]==0){
							zls++; 
							lflag=1;
							break;
						}
					}
				}
				if(lflag!=1){
					for(int i=l/100+1;i<=r/100;i++){
						zfs+=fs[i];
						if(ls[i]>0){
							zls++;
							lflag=1;
							break;
						}
					}
				}
				if(r%100!=99&&cflag!=1){
					for(int i=r/100*100;i<=r;i++){
						if(l>i)continue;
						if(a[i]<0)zfs++;
						if(a[i]==0){
							zls++;
							lflag=1;
							break;
						}
					}
				}
				if(lflag==1){
					cout<<"0";
				}else if(zfs%2==0){
					cout<<"+";
				}else{
					cout<<"-";
				}
			}
		}
		cout<<endl;
	}
	return 0;
}