prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'void trace_back_path()':
main.cpp:193:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < q.size(); i++)
                     ~~^~~~~~~~~~
In file included from main.cpp:11:0:
fib_heap.h: In instantiation of 'TYPE fib_heap<TYPE, COMP>::dequeue_min() [with TYPE = Point; COMP = compare_t]':
main.cpp:203:1:   required from here
fib_heap.h:170:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < z->child.size(); i ++) {
In file included from main.cpp:10:0:
unsorted_heap.h: In instantiation of 'TYPE unsorted_heap<TYPE, COMP>::dequeue_min() [with TYPE = Point; COMP = compare_t]':
main.cpp:203:1:   required from here
unsorted_heap.h:77:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < data.size(); i ++)
unsorted_heap.h: In instantiation of 'const TYPE& unsorted_heap<TYPE, COMP>::get_min() const [with TYPE = Point; COMP = compare_t]':
main.cpp:203:1:   required from here
unsorted_heap.h:90:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < data.size(); i ++)
In file included from main.cpp:11:0:
fib_heap.h: In instantiation of 'void fib_heap<TYPE, COMP>::Consolidate() [with TYPE = Point; COMP = compare_t]':
fib_heap.h:184:25:   required from 'TYPE fib_heap<TYPE, COMP>::dequeue_min() [with TYPE = Point; COMP = compare_t]'
main.cpp:203:1:   required from here
fib_heap.h:202:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < list.size(); i ++) {
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully