Compilare: main.cpp: In function 'int main()': main.cpp:19:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | while(i<s.size()) | ~^~~~~~~~~ main.cpp:41:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 41 | if(i>=1&&s[i-1]=='+'||s[i-1]=='-') | ~~~~^~~~~~~~~~~~~ main.cpp:53:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | if(i==s.size()-1) | ~^~~~~~~~~~~~ main.cpp:65:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | while(i<s.size()) | ~^~~~~~~~~ main.cpp:87:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 87 | if(i>=1&&s[i-1]=='+'||s[i-1]=='-') | ~~~~^~~~~~~~~~~~~ main.cpp:129:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 129 | if(i==s.size()-1) | ~^~~~~~~~~~~~ main.cpp:137:13: warning: unused variable 'ex' [-Wunused-variable] 137 | int ex=0,ans=1,cnt=0; | ^~ main.cpp:91:27: warning: 'semn' may be used uninitialized in this function [-Wmaybe-uninitialized] 91 | cx+=semn; | ~~^~~~~~ main.cpp:55:30: warning: 'semn' may be used uninitialized in this function [-Wmaybe-uninitialized] 55 | rez+=semn*val; | ~~~~^~~~