Compilare: user.cpp: In function ‘int main()’: user.cpp:47:9: warning: unused variable ‘sum’ [-Wunused-variable] int sum=0,i,s=0,j; ^ user.cpp:47:15: warning: unused variable ‘i’ [-Wunused-variable] int sum=0,i,s=0,j; ^ user.cpp:47:21: warning: unused variable ‘j’ [-Wunused-variable] int sum=0,i,s=0,j; ^ user.cpp:45:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi.in","r",stdin); ^ user.cpp:46:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi.out","w",stdout); ^ user.cpp:48:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&s); ^