Compilare: user.cpp: In function ‘int main()’: user.cpp:64:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(fscanf(fin, "%d ", &nrtests); nrtests; nrtests--){ ^ user.cpp: In function ‘char nextch()’: user.cpp:24:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fin); ^ user.cpp: In function ‘int main()’: user.cpp:52:60: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] int ans, x, y, vf, nrtests, b[2], inva[2], invb[2], i, t; ^