Compilare: main.cpp: In function 'int main()': main.cpp:106:35: warning: format '%lld' expects argument of type 'long long int', but argument 3 has type 'sum' [-Wformat=] fprintf(out,"%lld",s[1][1]); ^ main.cpp:43:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d%d",&v,&n,&st,&dr); ^ main.cpp:48:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&m[i][j]); ^