Main.cpp: In function 'int main()':
Main.cpp:25:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | for(int i=0;i<v.size();i++) {
| ~^~~~~~~~~
Main.cpp:28:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
28 | for(int j=0;j<adj[now].size();j++) {
| ~^~~~~~~~~~~~~~~~
Main.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
11 | scanf("%d %d",&n,&m);
| ~~~~~^~~~~~~~~~~~~~~
Main.cpp:14:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
14 | scanf("%d",&arr[i]);
| ~~~~~^~~~~~~~~~~~~~
Main.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
19 | scanf("%d %d %d",&u,&v,&w);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~