Created
January 29, 2019 07:08
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12532 - Interval Product
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#include <bits/stdc++.h> | |
using namespace std; | |
int N,K; | |
int List[100002]={0}; | |
int BIT1[100002]={0}; | |
int BIT2[100002]={0}; | |
void update(int* A, int idx, int val){ | |
while(idx<=N){ | |
A[idx]+=val; | |
idx += (idx&(-idx)); | |
} | |
} | |
int query(int *A, int idx){ | |
int s = 0; | |
while(idx){ | |
s+=A[idx]; | |
idx -= (idx&(-idx)); | |
} | |
return s; | |
} | |
int main(){ | |
ios_base::sync_with_stdio(0); | |
cin.tie(0); | |
int a,b,i,num; | |
char op; | |
while(cin>>N>>K){ | |
memset(List, 0, sizeof(List)); | |
memset(BIT1, 0, sizeof(BIT1)); | |
memset(BIT2, 0, sizeof(BIT2)); | |
for(i=1; i<=N; ++i){ | |
cin>>num; | |
if(num<0){ | |
update(BIT2,i,1); | |
} | |
else if(num == 0){ | |
update(BIT1,i,1); | |
} | |
List[i]=num; | |
} | |
for(i=1; i<=K; ++i){ | |
//cout<<"\n>"<<i<<": "; | |
cin>>op; | |
cin>>a>>b; | |
if(op == 'C'){ | |
if(b<0){ | |
if(List[a]>=0){ | |
update(BIT2, a, 1); | |
} | |
if(List[a] == 0){ | |
update(BIT1, a, -1); | |
} | |
} else if(b == 0){ | |
if(List[a] != 0){ | |
update(BIT1, a, 1); | |
} | |
if(List[a] < 0){ | |
update(BIT2, a, -1); | |
} | |
} else { | |
if(List[a] < 0){ | |
update(BIT2, a, -1); | |
} | |
if(List[a] == 0){ | |
update(BIT1, a, -1); | |
} | |
} | |
List[a] = b; | |
} else { | |
int lf = query(BIT1, a-1); | |
int rg = query(BIT1, b); | |
int dif = (rg-lf); | |
if( dif >0 ){ | |
cout<<"0"; | |
} else { | |
lf = query(BIT2, a-1); | |
rg = query(BIT2, b); | |
dif = rg-lf; | |
if(dif%2){ | |
cout<<"-"; | |
} else { | |
cout<<"+"; | |
} | |
} | |
} | |
} | |
cout<<endl; | |
} | |
return 0; | |
} |
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