Compilare: main.cpp: In function 'int main()': main.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int j = 0; j < op.size(); j++) | ~~^~~~~~~~~~~ main.cpp:68:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(int i = t+1; i < op.size(); i++) | ~~^~~~~~~~~~~ main.cpp:90:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for(int i = t+1; i < op.size(); i++) | ~~^~~~~~~~~~~ main.cpp:104:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 104 | for(int i = t+1; i < op.size(); i++) | ~~^~~~~~~~~~~ main.cpp:151:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 151 | for(int i = startk; i < k.size(); i++) | ~~^~~~~~~~~~