给定一个百分位数分数T，将其划分为以下五级之一： 90~100为A，80~89为B，70~79为c，60~69为ISD，0~59为EE。 有几个百分位数的分数(分数不超过1000)，请数数这五个级别中的人数，找出人数最多的级别，并按降序输出每个人的分数(只有一个级别，人数最多)。用c语言编写程序

以下是一个简单的C语言程序来实现这个任务：

#include <stdio.h>

int main() {
    int n, score, count_A = 0, count_B = 0, count_C = 0, count_D = 0, count_E = 0;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &score);
        if (score >= 90 && score <= 100) {
            count_A++;
        } else if (score >= 80 && score <= 89) {
            count_B++;
        } else if (score >= 70 && score <= 79) {
            count_C++;
        } else if (score >= 60 && score <= 69) {
            count_D++;
        } else {
            count_E++;
        }
    }
    int max_count = count_A, max_score = 0;
    if (count_B > max_count) {
        max_count = count_B;
        max_score = 80;
    }
    if (count_C > max_count) {
        max_count = count_C;
        max_score = 70;
    }
    if (count_D > max_count) {
        max_count = count_D;
        max_score = 60;
    }
    if (count_E > max_count) {
        max_count = count_E;
        max_score = 0;
    }
    printf("%d\n", max_count);
    if (max_score == 0) {
        for (int i = 0; i < n; i++) {
            if (score >= 0 && score <= 59) {
                printf("%d ", score);
            }
        }
    } else if (max_score == 60) {
        for (int i = 0; i < n; i++) {
            if (score >= 60 && score <= 69) {
                printf("%d ", score);
            }
        }
    } else if (max_score == 70) {
        for (int i = 0; i < n; i++) {
            if (score >= 70 && score <= 79) {
                printf("%d ", score);
            }
        }
    } else if (max_score == 80) {
        for (int i = 0; i < n; i++) {
            if (score >= 80 && score <= 89) {
                printf("%d ", score);
            }
        }
    } else {
        for (int i = 0; i < n; i++) {
            if (score >= 90 && score <= 100) {
                printf("%d ", score);
            }
        }
    }
    return 0;
}

输入格式：第一行输入整数n，表示分数数量。接下来n行，每行输入一个整数表示分数。

输出格式：第一行输出人数最多的级别中的人数。接下来输出每个人的分数(只有一个级别，人数最多)，按降序输出。