Compilare: main.cpp: In function 'void brut()': main.cpp:10:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <s.size();i++){ ~~^~~~~~~~~ main.cpp:12:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j <s.size();j++){ ~~^~~~~~~~~ main.cpp:14:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = j + 1;k<s.size();k++){ ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:30:23: warning: unused variable 'ans' [-Wunused-variable] unsigned long long ans = 0; ^~~ main.cpp:31:23: warning: unused variable 'sum' [-Wunused-variable] unsigned long long sum = 0; ^~~ main.cpp:32:23: warning: unused variable 'sumfrv' [-Wunused-variable] unsigned long long sumfrv = 0; ^~~~~~