Compilare: main.cpp: In function 'int main(int, const char**)': main.cpp:108:43: 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", &n, &m) ; ^ main.cpp:111:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &val) ; ^ main.cpp:126:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &val) ; ^