WA 90 pts:

#include <stdio.h>
#include <algorithm>
using namespace std;
const int S = 2e5 + 5;
const int MOD = 92084931;
typedef long long LL;
struct N {
    int v, id;
} s[S];
int n, m;
int a[S], sum[S], b[S], c[S];
LL ans;
bool cmp(N a, N b) {
    if (a.v != b.v) {
        return a.v < b.v;
    } else {
        return a.id < b.id;
    }
}
LL lowbit(LL x) {
    return x & (-x);
}
void update(LL x) {
    for ( ; x <= n; x += lowbit(x)) {
        c[x] = (c[x] + 1) % MOD;
    }
}
LL query(LL x) {
    LL ret = 0;
    for ( ; x; x -= lowbit(x)) {
        ret = (c[x] + ret) % MOD;
    }
    return ret;
}
int main() {
 //   freopen("P2804.in", "r", stdin);
  //  freopen("P2804.out", "w", stdout);
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= n; i++) {
        scanf("%d", &a[i]);
        a[i] -= m;
        sum[i] = sum[i - 1] + a[i];
        s[i].v = sum[i];
        s[i].id = i;
    }
    s[0].v = 0;
    s[0].id = 0;
    sort(s, s + n + 1, cmp);
    int cnt = 1;
    for (int i = 0; i <= n; i++) {
        if (i == 0) {
            b[s[i].id + 1] = cnt;
            cnt++;
        } else {
            if (s[i].v != s[i - 1].v) {
                cnt++;
            }
            b[s[i].id + 1] = cnt;
        }
    }/*
    for (int i = 1; i <= n + 1; i++) {
        printf("%d ", b[i]);
    }
    printf("\n");*/
    for (int i = 1; i <= n + 1; i++) {
        LL t = query(b[i] - 1);
 //       printf("%d ", t);
        ans = (ans + t) % MOD;
        update(b[i]);
    }
 //   printf("\n");
    printf("%lld", ans);
    return 0;
}

AC:

#include <stdio.h>
#include <algorithm>
using namespace std;
const int S = 2e5 + 5;
const int MOD = 92084931;
typedef long long LL;
struct N {
    int v, id;
} s[S];
int n, m;
int a[S], sum[S], b[S], c[S];
LL ans;
bool cmp(N a, N b) {
    if (a.v != b.v) {
        return a.v < b.v;
    } else {
        return a.id < b.id;
    }
}
LL lowbit(LL x) {
    return x & (-x);
}
void update(LL x) {
    for ( ; x <= n; x += lowbit(x)) {
        c[x] = (c[x] + 1) % MOD;
    }
}
LL query(LL x) {
    LL ret = 0;
    for ( ; x; x -= lowbit(x)) {
        ret = (c[x] + ret) % MOD;
    }
    return ret;
}
int main() {
//    freopen("P2804.in", "r", stdin);
//    freopen("P2804.out", "w", stdout);
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= n; i++) {
        scanf("%d", &a[i]);
        a[i] -= m;
        sum[i] = sum[i - 1] + a[i];
        s[i].v = sum[i];
        s[i].id = i;
    }
    s[0].v = 0;
    s[0].id = 0;
    sort(s, s + n + 1, cmp);
    int cnt = 1;
    for (int i = 0; i <= n; i++) {
        if (i == 0) {
            b[s[i].id + 1] = cnt;
        } else {
            if (s[i].v != s[i - 1].v) {
                cnt++;
            }
            b[s[i].id + 1] = cnt;
        }
    }/*
    for (int i = 1; i <= n + 1; i++) {
        printf("%d ", b[i]);
    }
    printf("\n");*/
    for (int i = 1; i <= n + 1; i++) {
        LL t = query(b[i] - 1) % MOD;
        ans = (ans + t) % MOD;
        update(b[i]);
    }
    printf("%lld", ans);
    return 0;
}

仅仅是把统计的 LL t = query(b[i] - 1); 多加了一个 % mod，但我想这个应该不会爆 long long 啊，为什么不取模就错了捏