poj 1654 Area

水题……

#include<iostream>#include<cstdio>#include<string>#include<cmath>using namespace std;void getxy(int &x,int &y,char m){switch(m){case '1':x--;y--;break;case '2':y--;break;case '3':x++;y--;break;case '4':x--;break;case '6':x++;break;case '7':x--;y++;break;case '8':y++;break;case '9':x++;y++;break;}}int main(){freopen("test.txt","r",stdin);int T;string str;int i;double area;int x1,y1,x2,y2;scanf("%d",&T);while(T--){cin>>str;int n=str.length();area=0;x2=0,y2=0;for(i=0;i<n;i++){if(str[i]=='5')break;x1=x2,y1=y2;getxy(x2,y2,str[i]);area+=(x1*y2-x2*y1);}area=fabs(area);area/=2;if(area==(__int64)area)         //小心数据溢出printf("%.0lf\n",area);elseprintf("%.1lf\n",area);}return 0;}