SRM300Div2

250

class Taxi {
public:
  double calc(int maxX, int taxiDis) {
    double x, y;
    x = min(maxX, taxiDis);
    y = taxiDis - x;
    return sqrt(x * x + y * y);
  }
  double maxDis(int maxX, int maxY, int taxiDis) {
    double r;
    if(maxX + maxY < taxiDis)return -1;
    return r = max( calc(maxX, taxiDis), calc(maxY, taxiDis) );
  }
};

500

class Dating {
public:
  string dates(string c, int k) {
    string r;
    vector<char> v;
    int idx = 0;
    for(int i=0; i<c.size(); ++i){
      v.push_back( c[i] );
    }
    char a = 'a', b = 'a';
    int j = 0;
    while( v.size() ){
      idx = (idx + k - 1) % v.size();      
      a = v[idx];
      int tmp = 1 << 22;
      for(int i=0; i<v.size(); ++i){
        if( islower(a) && islower(v[i]) )continue;
        if( isupper(a) && isupper(v[i]) )continue;
        int hot = a - v[i] - 'a' - 'A';
        if( tmp > abs(hot) ){
          tmp = abs(hot);
          j = i;
          b = v[i];
        }
      }
      if(tmp == (1 << 22))break;
      if(idx < j){
        v.erase( v.begin() + j );
        v.erase( v.begin() + idx );
      }
      else{
        v.erase( v.begin() + idx );
        v.erase( v.begin() + j );
        --idx;
      }
      if(r.size()) r += ' ';
      r += a;
      r += b;
    }
    return r;
  }
};