bitaro.cpp: In function 'std::vector<std::pair<int, int> > merge(std::vector<std::pair<int, int> >, std::vector<std::pair<int, int> >)':
bitaro.cpp:67:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
67 | for(int i = 0 ; i < b.size();i++){
| ~~^~~~~~~~~~
bitaro.cpp:70:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
70 | while(x < a.size() && y < b.size()){
| ~~^~~~~~~~~~
bitaro.cpp:70:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
70 | while(x < a.size() && y < b.size()){
| ~~^~~~~~~~~~
bitaro.cpp:79:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
79 | while(x < a.size()){
| ~~^~~~~~~~~~
bitaro.cpp:83:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
83 | while(y < b.size()){
| ~~^~~~~~~~~~
bitaro.cpp:88:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
88 | for(int i = 0;i < ans.size() && k.size() <= sq;i++){
| ~~^~~~~~~~~~~~
bitaro.cpp: In function 'int main()':
bitaro.cpp:130:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
130 | for(int i = 0; i < far[st].size();i++){
| ~~^~~~~~~~~~~~~~~~
bitaro.cpp: In function 'void usaco_problem()':
bitaro.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
32 | freopen("milkvisits.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
33 | freopen("milkvisits.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp: In function 'void init()':
bitaro.cpp:39:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
39 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:41:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
41 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~