Compilare: user.cpp: In function ‘int main()’: user.cpp:1276:21: warning: unused variable ‘sum’ [-Wunused-variable] unsigned long long sum = 0; ^ user.cpp:1277:21: warning: unused variable ‘n’ [-Wunused-variable] unsigned long long n; ^ user.cpp:1271:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("quadratum.in", "r", stdin); ^ user.cpp:1272:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("quadratum.out", "w", stdout); ^ user.cpp:1275:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:1281:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", nn); ^