pipioj 1452: 括号匹配Ⅱ（贪心） 

 1 #define bug(x) cout<<#x<<" is "<<x<<endl
 2 #define IO std::ios::sync_with_stdio(0)
 3 #include <bits/stdc++.h>
 4 using namespace  std;
 5 typedef long long ll;
 6 #define mk make_pair
 7 #define pb push_back
 8 const int inf=2147483647;
 9 const int N=1e5+10;
10 int n,m;
11 
12 char s[N];
13 
14 priority_queue<ll>q;
15 
16 int main(){
17 
18     scanf("%s",s+1);
19     n=strlen(s+1);
20     int k=0;
21     ll ans=0;
22     for(int i=1;i<=n;i++){
23         if(s[i]=='(')k++;
24         else if(s[i]==')'){
25             k--;
26             if(k<0){
27                 if(q.empty()){
28                     printf("-1\n");
29                     return 0;
30                 }
31                 else{
32                     ans-=q.top();
33                     q.pop();
34                     k+=2;
35                 }
36             }
37         }
38         else{
39             ll x,y;
40             scanf("%lld%lld",&x,&y);
41             if(k>0){
42                 k--;
43                 ans+=y;
44                 q.push(y-x);
45             }
46             else if(!q.empty()&&q.top()>y-x){
47                 k++;
48                 ans-=q.top();
49                 q.pop();
50                 ans+=y;
51                 q.push(y-x);
52             }
53             else{
54                 k++;
55                 ans+=x;
56             }
57         }
58     }
59     if(k)ans=-1;
60     printf("%lld\n",ans);
61 }

 

posted @ 2021-01-13 03:16  Venux  阅读(122)  评论(0)    收藏  举报