Sicily 1145. 校门外的树

重构之前代码 O(∩_∩)O~

#include <iostream>#include <cstring>using namespace std;int main(){int L,M,tree[10002],ans = 0;memset(tree,1,sizeof(tree));cin>>L>>M;while(M--){int st,ed;cin>>st>>ed;for(int i = st;i <= ed;++i)tree[i] = 0;}for(int i = 0;i <= L;++i)if(tree[i]) ans++;cout<<ans<<endl;//system ("pause");return 0;}