#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<stdio.h>
#include<string>
#include<unordered_map>
#include<vector>
#include<map>
#include<algorithm>
#include<queue>
#include<set>
#include<cstdio>
#include<math.h>
#include<cmath>
#include<memory.h>
using namespace std;
typedef long long ll;
int n, q;
int a[100001];
pair<int,int> block[100001];
int p;
int num;
void update(int idx, int val)
{
	int &rr=a[idx];
	if (val > 0)val = 1; else if (val < 0)val = -1;
	if (val == 0) {
		if (rr< 0)
			block[idx / num].second--,block[idx/num].first++;
		if (rr > 0)
			block[idx / num].first++;
	}
	else if (val > 0)
	{
		if (rr == 0)block[idx / num].first--;
		else if (rr < 0)
			block[idx / num].second--;
	}
	else {
		if (rr == 0)block[idx / num].first--, block[idx / num].second++;
		else if (rr > 0)
			block[idx / num].second++;
	}
	rr = val;
}
int main() {
	while (cin >> n >> q)
	{
		p = sqrt(n)+1;
		num = n / p;
		for (int i = 0; i < 1e4; ++i)
			block[i] = { 0,0 };
		for (int i = 1; i <= n; ++i)
		{
			scanf("%d", a + i);
			if (a[i] == 0)
				block[i / num].first++;
			else if (a[i] < 0)
				block[i / num].second++;
 
			if (a[i] < 0)a[i] = -1;
			else if (a[i]>0)a[i] = 1;
		}
 
		for (int i = 0; i<q; ++i) {
			char type;
 
			cin >> type;
			if (type == 'C')
			{
				int idx, val;
				scanf("%d %d", &idx, &val);
				update(idx, val);
			}
			else {
				int ans = 1;
				int LL, RR;
				scanf("%d %d", &LL, &RR);
				int f = LL / num;
				int s = RR / num;
				if (f == s)
				{
					int z=0, m=0;
					for (int i = LL; i <= RR; ++i)
						z += (a[i] == 0), m += (a[i] < 0);
					if (z)
						printf("0");
					else if (m % 2)
						printf("-");
					else
						printf("+");
				}
				else {
					int z = 0, m = 0;
					for (int i = LL; i <= (f + 1)*num - 1;++i)
						z += (a[i] == 0), m += (a[i] < 0);
					for (int i = f + 1; i < s; ++i)
						z += block[i].first, m += block[i].second;
					for (int i = s*num; i <= RR;++i)
						z += (a[i] == 0), m += (a[i] < 0);
					if (z)
						printf("0");
					else if (m % 2)
						printf("-");
					else
						printf("+");
 
				}
			}
 
 
		}
		puts("");
 
	}
}

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

23 50
87 -87 -20 -94 20 -99 98 68 -73 -14 -43 63 -34 2 75 63 61 -8 31 -68 -86 -24 -60 
C 7 -92
C 16 26
C 4 -77
P 6 22
C 19 -53
C 18 -27
C 12 39
C 9 -51
C 16 -44
P 13 21
C 21 -74
C 10 69
C 5 21
C 6 50
P 1 2
P 20 20
C 19 -49
C 15 93
P 19 19
P 13 14
C 23 -89
P 7 13
P 19 19
P 2 14
C 21 90
C 9 60
P 15 19
P 14 21
P 8 12
C 1 62
P 1 22
C 1 -34
P 1 21
P 5 14
P 23 23
C 20 -56
P 15 15
C 21 -9
P 2 10
C 16 85
P 16 21
P 19 20
C 15 -45
C 7 -94
C 5 12
C 2 94
P 22 23
C 4 13
C 9 40
C 17 -70
14 30
13 -48 55 -11 43 70 83 -18 -62 10 16 25 -78 -98 
P 6 11
C 4 75
P 1 12
P 14 14
P 14 14
P 10 10
C 3 -3
P 9 9
C 3 66
C 7 84
C 10 -88
P 8 11
C 13 34
P 9 11
C 9 9
C 13 25
P 14 14
C 1 -70
P 14 14
C 12 -98
C 12 48
C 9 -34
P 13 13
P 9 14
P 9 11
P 7 14
C 3 -48
C 10 -24
C 4 -15
C 14 -40
11 25
21 -68 72 -36 -61 12 -20 -66 9 -17 32 
P 9 10
C 1 60
C 7 28
P 1 11
P 2 3
C 9 9
P 7 11
P 11 11
C 9 -81
P 4 11
C 4 26
C 1 49
P 1 11
P 1 3
P 6 10
P 5 10
C 11 -100
P 3 6
C 8 36
C 6 8
P 7 7
P 7 9
P 8 9
P 2 10
P 1 6
8 44
-3 -32 79 -8 -34 30 -47 22 
C 1 -96
C 1 23
C 6 -84
P 6 6
P 7 8
C 4 33
P 4 6
C 3 -10
C 4 -46
P 3 4
P 3 8
P 7 7
C 5 86
P 4 4
C 2 -94
C 3 85
C 6 15
C 2 -75
C 1 -91
C 4 36
P 7 7
P 3 7
C 8 -83
C 7 39
P 1 6
P 8 8
P 3 7
P 1 3
P 5 7
C 6 22
P 5 5
P 1 7
P 3 8
C 8 -99
P 2 4
C 8 37
P 3 7
P 2 7
C 8 57
P 5 7
C 5 70
C 1 50
P 3 3
P 1 7
15 40
38 51 -19 -2 68 16 76 18 100 -89 75 59 -41 62 50 
C 7 63
P 8 9
C 8 -27
C 15 -82
C 8 -68
P 3 12
P 3 13
C 7 -66
C 1 23
P 11 15
C 10 74
C 11 -53
C 8 -46
C 8 6
C 2 0
P 2 12
P 9 9
C 6 43
P 10 13
P 5 14
P 11 12
C 13 -76
P 1 10
C 5 -28
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