Compilare: main.cpp: In function 'int main()': main.cpp:34:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | while(i<s.size()) | ~^~~~~~~~~ main.cpp:47:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | if(i+1<s.size() && s[i+1]!=')') | ~~~^~~~~~~~~ main.cpp:55:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | while(i<s.size() && isdigit(s[i])) val=val*10 +s[i]-48, i++; i--; | ~^~~~~~~~~ main.cpp:55:13: warning: this 'while' clause does not guard... [-Wmisleading-indentation] 55 | while(i<s.size() && isdigit(s[i])) val=val*10 +s[i]-48, i++; i--; | ^~~~~ main.cpp:55:74: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while' 55 | while(i<s.size() && isdigit(s[i])) val=val*10 +s[i]-48, i++; i--; | ^ main.cpp:57:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | if(i+1<s.size() && s[i+1]!=')') | ~~~^~~~~~~~~ main.cpp: In function 'int priority(char)': main.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] 19 | } | ^