Compilare: main.cpp: In member function 'bool query::operator<(const query&) const': main.cpp:24:24: warning: comparison of constant ''u'' with boolean expression is always false [-Wbool-compare] 24 | return tip == 'u'; | ~~~~^~~~~~ main.cpp: In function 'int main()': main.cpp:254:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 254 | while ( j < queryX.size() ) { | ~~^~~~~~~~~~~~~~~ main.cpp:257:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 257 | while ( l < queryX.size() && queryX[j].x == queryX[l].x ) { | ~~^~~~~~~~~~~~~~~ main.cpp:275:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 275 | while ( j < queryY.size() ) { | ~~^~~~~~~~~~~~~~~ main.cpp:278:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 278 | while ( l < queryY.size() && queryY[j].x == queryY[l].x ) { | ~~^~~~~~~~~~~~~~~