Compilare: main.cpp: In function 'int main()': main.cpp:62:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m) ; ^ main.cpp:66:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", v + i) ; ^ main.cpp:72:52: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &left, &right) ; ^ main.cpp: In function 'int get_answer(int, int, int)': main.cpp:2:32: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized] #define MIN(a, b) (((a) > (b)) ? b : a) ^ main.cpp:36:13: note: 'ret' was declared here int ret ; ^~~