Compilare: user.cpp: In function ‘int main()’: user.cpp:43:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d",&N,&M,&C,&R); ^ user.cpp:44:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d%d",&x,&y,&z,&w,&u); ^ user.cpp:45:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=M;i++) {fscanf(f,"%lld",&A[1][i]);MA[1][i]=max(MA[1][i-1],A[1][i]);S[1][i]=A[1][i]+S[1][i-1];} ^ user.cpp:46:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=2;i<=N;i++) {fscanf(f,"%lld",&A[i][1]);MA[i][1]=S[i][1]=A[i][1];} ^