Compilare: main.cpp: In function 'int main()': main.cpp:23:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol.size()!=n) ~~~~~~~~~~^~~ main.cpp:25:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sol.size();j++) ~^~~~~~~~~~~ main.cpp:33:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ~^~~~~~~~~~~ main.cpp:33:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=0;i<sol.size();i++) ^~~ main.cpp:35:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~