Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:18:16: warning: unused variable 'val' [-Wunused-variable] int maxx=0,val; ^~~ main.cpp: In function 'int main()': main.cpp:53:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:55:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &x, &y); ^ main.cpp:60:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^