Compilare: user.cpp: In function ‘int main()’: user.cpp:21:41: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘std::map<short unsigned int, short int>::mapped_type* {aka short int*}’ [-Wformat=] for(i=1;i<=n;i++) fscanf(f,"%d",&r[0][i]); ^ user.cpp:19:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:21:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++) fscanf(f,"%d",&r[0][i]); ^ user.cpp:30:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d %d",&a,&b); ^