很奇怪啊这个l和m变量，第一个for循环之后都变成1了，求助大佬

yuxiaoyu20090104 @ 2022-08-16 19:17:03

#include<iostream>
using namespace std;
int a[1005];
int m, l;
int main()
{
    cin >> l >> m;
    for (int i = 1; i <= m; i++)
    {
        int x, y;
        cin >> x >> y;
        for (int j = x; j <= y; j++)a[j] = 1;
    }
    int cnt = 0;
    for (int i = 1; i <= l; i++)
        if (a[i] == 0)
            cnt++;
    cout << cnt << endl;
    return 0;
}

by _i_i_ @ 2022-08-16 19:21:38

@xiaoxiao090104 数组大小 10^4

by JustinXiaoJunyang @ 2022-08-16 19:21:45

@xiaoxiao090104 求关注～

#include <iostream>
using namespace std;

int main()
{
    int l, m;
    cin >> l >> m;
    int start, stop;
    int left = 0;
    bool a[l];
    for (int i = 0; i <= l; i++)
    {
        a[i] = true;
    }
    for (int i = 1; i <= m; i++)
    {
        cin >> start >> stop;
        for (int j = start; j <= stop; j++)
        {
            a[j] = false;
        }
    }
    for (int i = 0; i <= l; i++)
    {
        if (a[i] == true)
        {
            left++;
        }
    }
    cout << left << endl;
    return 0;
}

by seanlsy @ 2022-08-16 19:23:36

额下面那个循环应当从 1 开始

by yuxiaoyu20090104 @ 2022-08-16 19:30:20

@seanlsy 不是吧，马路的开端是0诶

by yuxiaoyu20090104 @ 2022-08-16 19:30:51

@__uint32_t 好的谢谢，已经AC了

by seanlsy @ 2022-08-16 19:36:20

@xiaoxiao090104 抱歉打错了

by gongziwen @ 2022-08-16 20:00:33

@JustinXiaoJunyang

    bool a[l];