Compilare: main.cpp: In function 'int main()': main.cpp:16:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ~^~~~~~~~~ main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=i+1;k<s.size();k++){ ~^~~~~~~~~ main.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=k+1;j<s.size();j++) ~^~~~~~~~~ main.cpp:16:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=0;i<s.size();i++) ^~~ main.cpp:29:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' out<<ans; ^~~