Compilare: main.cpp: In function 'void solve_ops()': main.cpp:35:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i=0;i<ops.size();i++) { | ~^~~~~~~~~~~ main.cpp:47:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for (int i=0;i<ops.size();i++) { | ~^~~~~~~~~~~ main.cpp:59:9: warning: unused variable 'auau' [-Wunused-variable] 59 | int auau = nr[0]; | ^~~~ main.cpp: In function 'int main()': main.cpp:67:14: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 67 | while (aa!=strlen(s)) { | ~~^~~~~~~~~~~