Compilare: main.cpp:5:0: warning: "INFOARENA" redefined #define INFOARENA <command-line>:0:0: note: this is the location of the previous definition main.cpp: In function 'int main()': main.cpp:50:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tj.in", "r", stdin); ^ main.cpp:51:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tj.out", "w", stdout); ^