Compilare: main.cpp: In function 'int main()': main.cpp:88:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size() && p2 < v[calc].size()){ ~~~^~~~~~~~~~~~~~~~~ main.cpp:88:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size() && p2 < v[calc].size()){ ~~~^~~~~~~~~~~~~~~~ main.cpp:103:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < lvl[i-1].size()){ ~~~^~~~~~~~~~~~~~~~~ main.cpp:112:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p2 < v[calc].size()){ ~~~^~~~~~~~~~~~~~~~ main.cpp:49:40: warning: unused variable 'st' [-Wunused-variable] int n , x , elem = 0 , i , a , b , st , dr , val1 , val2 , curr , ant; ^~ main.cpp:49:45: warning: unused variable 'dr' [-Wunused-variable] int n , x , elem = 0 , i , a , b , st , dr , val1 , val2 , curr , ant; ^~ main.cpp:50:19: warning: unused variable 'vecin' [-Wunused-variable] int nod , j , vecin , sol , p1 , p2 , idx , calc; ^~~~~ main.cpp:50:43: warning: unused variable 'idx' [-Wunused-variable] int nod , j , vecin , sol , p1 , p2 , idx , calc; ^~~ main.cpp:51:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff , 1 , 1000000 , fin); ^