Compilare: main.cpp: In function 'int getint()': main.cpp:9:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] std::scanf("%d", &x); ^ main.cpp: In function 'void test_one()': main.cpp:80:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] std::scanf("%d%d%d", &op, &a, &b); ^ main.cpp: In function 'int main()': main.cpp:131:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] std::freopen("baruri.in", "r", stdin); ^ main.cpp:132:48: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] std::freopen("baruri.out", "w", stdout); ^