View Compilation Error

0_0_30616171_27089.cpp: In function 'void solve()':
0_0_30616171_27089.cpp:79:20: error: unable to find numeric literal operator 'operator""t'
   if((mid+600)*v2<=1e-7t*v1*v2+(600-mid)*v1) {
                    ^
0_0_30616171_27089.cpp:79:20: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes