Compilare: user.cpp: In function ‘void Back(int, int, int, int)’: user.cpp:10:11: warning: unused variable ‘p’ [-Wunused-variable] int p=1,ok=1; ^ user.cpp:10:15: warning: unused variable ‘ok’ [-Wunused-variable] int p=1,ok=1; ^ user.cpp: In function ‘int Suma(int)’: user.cpp:26:7: warning: unused variable ‘j’ [-Wunused-variable] int i,j,s,c; ^ user.cpp: In function ‘int main()’: user.cpp:63:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(in); ^ user.cpp:64:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(ouT); ^ user.cpp:65:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:67:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^