Compilare: main.cpp: In function 'int main()': main.cpp:51:18: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i=0;i<strlen(s);i++) | ~^~~~~~~~~~ main.cpp: In function 'void factor(int&)': main.cpp:29:9: warning: 'lastch' may be used uninitialized in this function [-Wmaybe-uninitialized] 29 | if(lastch==')') | ^~