Compilare: main.cpp: In function 'mare unul()': main.cpp:38:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p >= s.size()) ~~^~~~~~~~~~~ main.cpp:46:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p >= s.size() || s[p] != ')') ~~^~~~~~~~~~~ main.cpp: In function 'mare inmul()': main.cpp:66:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < s.size() && s[p] == '*') ~~^~~~~~~~~~ main.cpp:72:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < s.size() && s[p] == '(') ~~^~~~~~~~~~ main.cpp: In function 'mare adun()': main.cpp:83:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < s.size() && s[p] == '+') ~~^~~~~~~~~~ main.cpp:89:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < s.size() && s[p] == '(') ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:104:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0, st = 0; i<s.size() && st >= 0; i++) ~^~~~~~~~~