View Compilation Error

0_0_30573080_25742.cpp:16:2: error: no matching function for call to 'nd::nd()'
 }t;
  ^
0_0_30573080_25742.cpp:16:2: note: candidates are:
0_0_30573080_25742.cpp:13:5: note: nd::nd(int, int, long long int)
     nd(int _id,  int _cur, long long w) {
     ^
0_0_30573080_25742.cpp:13:5: note:   candidate expects 3 arguments, 0 provided
0_0_30573080_25742.cpp:7:8: note: constexpr nd::nd(const nd&)
 struct nd{
        ^
0_0_30573080_25742.cpp:7:8: note:   candidate expects 1 argument, 0 provided
0_0_30573080_25742.cpp:7:8: note: constexpr nd::nd(nd&&)
0_0_30573080_25742.cpp:7:8: note:   candidate expects 1 argument, 0 provided