Compilare: main.cpp: In function 'int main()': main.cpp:107:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &n); ^ main.cpp:108:32: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s + 1, MAXN + 5, fin); ^ main.cpp:110:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &q); ^ main.cpp: In function 'char nextch()': main.cpp:14:63: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (pos == BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos = 0; ^