Eroare de compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:12:18: error: ‘N’ was not declared in this scope scanf("%d", &N); ^ user.cpp:13:18: error: expected primary-expression before ‘)’ token scanf("%d", &); ^ user.cpp:15:8: error: ‘n’ was not declared in this scope S=(n+1)*(n*n-n); ^ user.cpp:9:9: warning: unused variable ‘ns’ [-Wunused-variable] int ns,P; ^ user.cpp:6:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma.in", "r", stdin); ^ user.cpp:7:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma.out", "w", stdout); ^