Compilare: main.cpp: In function 'bool found(int)': main.cpp:10:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for (int ai = 1; ai < a.size(); ai++) { | ~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:23:23: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 23 | for (size_t i = 0; i < pin && i < 1000; i++) g << pos[i] << " "; | ~~^~~~~