Compilare: main.cpp: In function 'int main()': main.cpp:13:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d %d ", &n, &x, &y, &q); ^ main.cpp:31:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c %d %d ", &c, &k, &p); ^ main.cpp:53:19: warning: 'mij' may be used uninitialized in this function [-Wmaybe-uninitialized] int st, dr, mij; ^~~ main.cpp:33:19: warning: 'mij' may be used uninitialized in this function [-Wmaybe-uninitialized] int st, dr, mij; ^~~