Compilare: user.cpp: In function ‘int main()’: user.cpp:69:65: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d %d %d %d", &N, &M, &l0, &c0, &lf, &cf); ^ user.cpp:72:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &ma[i][j]); ^