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#include <iostream>
#include <stdlib.h>
#include <map>
using namespace std;
struct node {
int a, b;
};
map<int, node>v;
int f[1005] = { 0 };
int main()
{
int L, M;
cin >> L >> M;
for (int i = 0; i <= L; i++)
{
f[i] = 1;
}
for (int i = 1; i <= M; i++)
{
scanf("%d%d",&v[i].a,&v[i].b);
for (int j = v[i].a; j <= v[i].b; j++)
{
f[j] = 0;
}
}
int cnt=0;
for (int i = 0; i <= L; i++)
{
if (f[i...
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数组开小了