Compilare: user.cpp: In function ‘void solve()’: user.cpp:38:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &n); ^ user.cpp:50:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &nr); ^ user.cpp:100:79: warning: array subscript is below array bounds [-Warray-bounds] rez = mxa((sum[ex] - sum[sxx - 1]) * mxnr(sxx, ex), (sum[ei] - sum[sii - 1]) * mxnr(sii, ei)); ^