Compilare: main.cpp: In function 'int main()': main.cpp:12:9: warning: unused variable 'nr1' [-Wunused-variable] int nr1,nr2,ul1=0,ll1=NMAX,ul2=0,ll2=NMAX; ^~~ main.cpp:12:13: warning: unused variable 'nr2' [-Wunused-variable] int nr1,nr2,ul1=0,ll1=NMAX,ul2=0,ll2=NMAX; ^~~ main.cpp:9:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tribute.in","r",stdin); ^ main.cpp:10:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tribute.out","w",stdout); ^ main.cpp:14:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&x1,&y1); ^ main.cpp:17:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^