Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:23:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i + 1 < cur.size() && cur[i] + cur[i + 1] > k) { ~~~~~~^~~~~~~~~~~~ user.cpp:27:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i + 1 == cur.size()) { ~~~~~~^~~~~~~~~~~~~ user.cpp:33:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < cur.size()) ~~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:42:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&k); ^ user.cpp:45:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&x,&y); ^