Compilare: main.cpp: In function 'int main()': main.cpp:67:84: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~^~~ main.cpp:67:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:76:84: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~^~~ main.cpp:76:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:85:80: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~^~~ main.cpp:85:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:90:80: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~^~~ main.cpp:90:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(dend != -1 && sol.back().first == dend || dend == -1&&sol.size()==n) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:99:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=sol.size()-1;i>=0 && i>=sol.size()-n;i--) ~^~~~~~~~~~~~~~