Compilare: main.cpp: In function 'int main()': main.cpp:66:84: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~^~~ main.cpp:66:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:74:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:82:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:86:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:91:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=sol.size()-1;i>=0 && i>=sol.size()-n;i--) ~^~~~~~~~~~~~~~