Compilare: main.cpp: In function 'int main()': main.cpp:123:9: warning: unused variable 'a' [-Wunused-variable] int a = 3, b = 4; ^ main.cpp:123:16: warning: unused variable 'b' [-Wunused-variable] int a = 3, b = 4; ^ main.cpp:110:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.in", "r", stdin); ^ main.cpp:111:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.out", "w", stdout); ^