1203: 伤害计算

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int mod=1e9+7;
const int N=5e3+5;
double ans;
int a[N];

int main(){
    ios::sync_with_stdio(0);
    string s;
    cin>>s;
    int n=s.size(),j=1;
    for(int i=0;i<n;i++)
        if(s[i]==‘+‘)
        a[j++]=i;
        //cout<<j<<endl;
        a[0]=-1;
    for(int i=1;i<j;i++){
        int k=a[i-1]+1,x=0,y=0;
            while(s[k]!=‘d‘&&k<a[i]){
                x=10*x+s[k]-‘0‘;
                k++;
            }
            k++;
            while(k<a[i]){
                y=10*y+s[k]-‘0‘;
                k++;
            }
            //cout<<x<<‘ ‘<<y<<endl;
            if(y) ans+=1.0*x*(y+1)/2;
            else ans+=x;
        }
    int k=a[j-1]+1;int x=0,y=0;
            while(s[k]!=‘d‘&&k<n){
                x=10*x+s[k]-‘0‘;
                k++;
            }
            k++;
            while(k<n){
                y=10*y+s[k]-‘0‘;
                k++;
            }
            //cout<<x<<" ."<<y<<endl;
            if(y) ans+=1.0*x*(y+1)/2;
            else ans+=x;
    if(floor(ans)==ans) printf("%.0lf\n",ans);
    else printf("%.1lf\n",ans);
    return 0;
}