HDU1202 無語題

        這一題WA了8次。再看討論時，罵聲一片!個人也覺得這題出的不好。貼在這，供後來者借鑒。

 

#include<iostream>#include<iomanip>using namespace std;double judge_score(int tem)  //分數對應的點數，題目給出的只是整數，所以調用時要強制類型轉化{if(tem>=90 && tem<=100)return 4.0;else if(tem>=80 && tem<=89)return 3.0;else if(tem>=70 && tem<=79)return 2.0;else if(tem>=60 && tem<=69)return 1.0;return 0.0;}int main(){int t,i;double credit,score;while(cin>>t){double all_score=0.0,all_credit=0.0;for(i=0;i<t;i++){cin>>credit>>score;if(score!=-1)  //分數為-1，不計算{all_score+=judge_score(int(score))*credit; //分數的強制類型轉化，應該很重要，沒做這個，結果WA了8次all_credit+=credit;}}if(all_credit==0.0 || all_score==0.0)  //GPA不存在{cout<<-1<<endl;continue;}double GPA=all_score*1.0/all_credit;cout<<setiosflags(ios::fixed)<<setprecision(2)<<GPA<<endl;}return 0;}