drvca.cpp: In function 'void PlayGround()':
drvca.cpp:31:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
31 | for(int i=2; i<v3.size(); ++i) {
| ~^~~~~~~~~~
drvca.cpp:48:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
48 | for(int i=2; i<v1.size(); ++i) {
| ~^~~~~~~~~~
In file included from /usr/include/c++/10/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:45,
from /usr/include/c++/10/ext/pb_ds/detail/container_base_dispatch.hpp:90,
from /usr/include/c++/10/ext/pb_ds/assoc_container.hpp:48,
from drvca.cpp:2:
drvca.cpp:54:40: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
54 | assert((int)v0.size()+v1.size()==N);
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~
drvca.cpp: In function 'int main()':
drvca.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
71 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~