tree.cpp: In function 'void delete_edge(int)':
tree.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<L1.size(); i++){
~^~~~~~~~~~
tree.cpp:38:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<L2.size(); i++){
~^~~~~~~~~~
tree.cpp:65:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<dec[v1].size(); i++){
~^~~~~~~~~~~~~~~
tree.cpp:75:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<dec[v2].size(); i++){
~^~~~~~~~~~~~~~~
tree.cpp:86:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<L1.size(); i++){
~^~~~~~~~~~
tree.cpp:92:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<L2.size(); i++){
~^~~~~~~~~~
tree.cpp: In function 'void input()':
tree.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &N, &Q);
~~~~~^~~~~~~~~~~~~~~~
tree.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &par[i]);
~~~~~^~~~~~~~~~~~~~~
tree.cpp: In function 'int main()':
tree.cpp:105:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d", &u, &v, &q);
~~~~~^~~~~~~~~~~~~~~~~~~~~~