Compilare: main.cpp: In function 'int main()': main.cpp:18:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int n, m; fscanf(in, "%d%d", &n, &m); ^ main.cpp:19:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] char rdd; fscanf(in, "%c", &rdd); ^ main.cpp:26:36: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(reads + 1, m + 2, in); ^