Compilare: main.cpp: In function 'll suma()': main.cpp:18:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[ind]=='+' and ind<s.size()) ~~~^~~~~~~~~ main.cpp:25:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll l=0;l<v.size();++l) ~^~~~~~~~~ main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll i=0;i+l<v.size();++i) ~~~^~~~~~~~~ main.cpp: In function 'll prod()': main.cpp:44:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[ind]=='*' and ind<s.size()) ~~~^~~~~~~~~ main.cpp:51:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll l=0;l<v.size();++l) ~^~~~~~~~~ main.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll i=0;i+l<v.size();++i) ~~~^~~~~~~~~ main.cpp: In function 'll term()': main.cpp:68:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind>=s.size()) ~~~^~~~~~~~~~ main.cpp:77:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind>=s.size() or s[ind]!=')') ~~~^~~~~~~~~~ main.cpp:87:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<s.size() and s[ind]>='0' and s[ind]<='9') ~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:107:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind<s.size()) ans=0; ~~~^~~~~~~~~