Initiate Luogu

Luogu/P1047校外的树.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+using namespace std; 
+int main(){
+	int l,m;
+	int start,end; 
+	cin>>l>>m;
+	int a[l+1];
+	for(int i=0;i<=l;i++){
+		a[i]=1;
+	}
+	for(int i=0;i<m;i++){
+		cin>>start>>end;
+		//cout<<"yes"<<endl;
+		for(int j=start;j<=end;j++){
+			a[j]=0; 
+			//cout<<j<<" set 0"<<endl;
+		}
+	}
+	int js=0;
+	for(int i=0;i<=l;i++){
+		//cout<<i<<" "<<a[i]<<endl;
+		if(a[i]==1) {
+			js++;
+		}
+	}
+	cout<<js<<endl;
+	return 0;
+}