Compilare: user.cpp: In function ‘int Term()’: user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V.size();i++){ ^ user.cpp: In function ‘int Expresie()’: user.cpp:61:9: warning: unused variable ‘x’ [-Wunused-variable] int x,sum; ^ user.cpp: In function ‘int main()’: user.cpp:76:25: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a=='-'||a>='0'&&a<='9'){ ^