Compilare: main.cpp: In function 'int main()': main.cpp:21:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ~^~~~~~~~~ main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<s.size();j++) { ~^~~~~~~~~ main.cpp:35:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(k<i || k>j) ^~ main.cpp:37:25: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' k++; ^