Submission #3456047

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Source Code Expand

#include<iostream>
#include<cstdio>
using namespace std;
int a[300010],b[300010],n,m,s;
bool vis[300010];
inline int read(){
	char ch=getchar();int x=0;
	while(ch<'0'||ch>'9') ch=getchar();
	while(ch>='0'&&ch<='9') {x=(x<<3)+(x<<1)+ch-'0';ch=getchar();}
	return x;
}
int main(){
    int x,y;
    scanf("%d%d",&n,&m);
	for(register int i=1;i<=m;i++){
		scanf("%d%d",&x,&y);
		if(x>y) swap(x,y);
		a[x]++;a[y+1]--;
		for(register int j=x;j<=y;j++){
		    if(b[j]) break;
			b[j]=i;
		}
		for(register int j=y;j>=x;j--){
		    if(b[j]) break;
			b[j]=i;
		}
	}
	for(register int i=1;i<=n;i++){
		a[i]+=a[i-1];
		if(a[i]==1) vis[b[i]]=1;
	}
	for(register int i=1;i<=m;i++)
	if(!vis[i]) s++;
	if(s) cout<<s<<endl;
	for(register int i=1;i<=m;i++)
	if(!vis[i]) cout<<i<<endl;
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^
./Main.cpp:16:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
                      ^

Judge Result