Compilare: user.cpp: In function ‘void main3()’: user.cpp:58:78: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(out,"%d %d %d %d\n",lower[d].x, lower[d].y, upper[u].x, upper[u].y); ^ user.cpp:58:78: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘long long int’ [-Wformat=] user.cpp:58:78: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘long long int’ [-Wformat=] user.cpp:58:78: warning: format ‘%d’ expects argument of type ‘int’, but argument 6 has type ‘long long int’ [-Wformat=] user.cpp: In function ‘int main()’: user.cpp:140:13: warning: NULL used in arithmetic [-Wpointer-arith] if(up[a]==NULL) ^ user.cpp:132:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:138:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&a,&b,&c); ^