auto 不会用
举个例子:
#include<cstdio>
#include<vector>
#include<algorithm>
#define fir first
#define sec second
#define re register int
using namespace std;
const int N=1e6+7;
int n,m,a[N],s[N];
vector<int> alls;
vector<pair<int,int>> add,query;
inline int find(int x){
int l=0,r=alls.size()-1;
while(l<r){
int mid=l+r>>1;
if(alls[mid]>=x){
r=mid;
}
else{
l=mid+1;
}
}
return r+1;
}
int main(){
scanf("%d%d",&n,&m);
for(re i=0;i<n;i++){
int x,c;
scanf("%d%d",&x,&c);
add.push_back({x,c});
alls.push_back(x);
}
for(re i=0;i<m;i++){
int l,r;
scanf("%d%d",&l,&r);
query.push_back({l,r});
alls.push_back(l);
alls.push_back(r);
}
sort(alls.begin(),alls.end());
alls.erase(unique(alls.begin(),alls.end()),alls.end());
for(auto item:add){
int u=find(item.fir);
a[u]+=item.sec;
}
for(re i=1;i<=alls.size();i++){
s[i]=s[i-1]+a[i];
}
for(auto item:query){
int l=find(item.fir),r=find(item.sec);
printf("%d\n",s[r]-s[l-1]);
}
return 0;
}
这个代码是离散化,但auto item:add和auto item:query那里搞不懂