Compilare: main.cpp: In function 'int solve1()': main.cpp:28:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && s[i] !=')') ~^~~~~~~~~ main.cpp: In function 'int solve2()': main.cpp:81:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && s[i] !=']') ~^~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:129:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size()) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:177:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++) ~^~~~~~~~~