OJ

#define lowbit(x) x & (-x)
#include <cstdio>
#define ll long long
int n;
const int maxn = 1000005;
int a[maxn] = {0};
ll sum1[maxn], sum2[maxn];
int Q[5];

void updata(int i, int k) {
    int x = i;
    while(i <= n) {
        sum1[i] += k;
        sum2[i] += k * (x - 1);
        i += lowbit(i);
    }
}
ll getsum(int i) {
    ll res = 0;
    int x = i;
    while(i > 0) {
        res += x * sum1[i] - sum2[i];
        i -= lowbit(i);
    }
    return res;
}
int main() {
    int query;
    scanf("%d%d", &n, &query);
    for(int i = 1; i <= n; i++) {
        scanf("%d", &a[i]);
        updata(i, a[i] - a[i - 1]);
    }
    int a, b, c;
    while(query--) {
        scanf("%s%d%d", Q, &a, &b);
        if(Q[0] == 'Q') printf("%lld\n", getsum(b) - getsum(a - 1));
        else if(Q[0] == 'C') {
            scanf("%d", &c);
            updata(a, c);
            updata(b + 1, c);
        }
    }
    return 0;
}