Compilare: user.cpp: In function ‘int main()’: user.cpp:43:6: warning: unused variable ‘i’ [-Wunused-variable] int i, j, k,n,m,x,y,t,maxim=0; ^ user.cpp:43:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k,n,m,x,y,t,maxim=0; ^ user.cpp:43:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k,n,m,x,y,t,maxim=0; ^ user.cpp:43:22: warning: unused variable ‘t’ [-Wunused-variable] int i, j, k,n,m,x,y,t,maxim=0; ^ user.cpp:43:24: warning: unused variable ‘maxim’ [-Wunused-variable] int i, j, k,n,m,x,y,t,maxim=0; ^ user.cpp:45:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("test.in", "r", stdin); ^ user.cpp:46:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("test.out", "w", stdout); ^ user.cpp:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^