Compilare: user.cpp: In function ‘int main()’: user.cpp:73:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d\n", &n, &k, &m); ^ user.cpp:76:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", x + i); ^ user.cpp:78:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", y + i); ^ user.cpp:98:33: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%lld\n", (ok + 1) / 2); ^ user.cpp:88:29: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] long long mij = (st + dr) >> 1; ^