import sys

MOD = 998244353

def main():
    import sys
    sys.setrecursionlimit(1 << 25)
    n, q = map(int, sys.stdin.readline().split())
    A = list(map(int, sys.stdin.readline().split()))
    for _ in range(q):
        L, R = map(int, sys.stdin.readline().split())
        B = A[L-1:R]
        while len(B) > 1:
            max_val = max(B)
            idx = B.index(max_val)
            for j in range(idx):
                B[j] = (B[j] + B[idx]) % MOD
            del B[idx]
        print(B[0] % MOD)

if __name__ == "__main__":
    main()