Compilare: user.cpp: In function ‘int F(int, int)’: user.cpp:8:9: warning: unused variable ‘i’ [-Wunused-variable] int i, two, is, cnt = 0; ^ user.cpp: In function ‘int main()’: user.cpp:30:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&T,&P); ^ user.cpp:33:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d %d",&L1,&C1,&L2,&C2); ^