molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
23 | for(int i = 0; i < _w.size(); i ++) w.pb(i);
| ~~^~~~~~~~~~~
molecules.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | for(int i = 0; i < w.size(); i ++){
| ~~^~~~~~~~~~
molecules.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
35 | for(int i = 1; i < w.size(); i ++){
| ~~^~~~~~~~~~
molecules.cpp:29:9: warning: unused variable 'ptr' [-Wunused-variable]
29 | int ptr = 0;
| ^~~
molecules.cpp: In function 'int main()':
molecules.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
61 | freopen(task ".inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
molecules.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
62 | freopen(task ".out","w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/cczwXkFx.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc8xVY3x.o:molecules.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status