Compilare: main.cpp:108:0: warning: "dbg" redefined #define dbg(x...) main.cpp:101:0: note: this is the location of the previous definition #define dbg(x...) pr("[", #x, "] = ["), pc(x); main.cpp: In function 'int main()': main.cpp:116:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cover.in", "r", stdin); ^ main.cpp:117:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cover.out", "w", stdout); ^ main.cpp:121:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &l); ^ main.cpp:123:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (int i = 0; i < l; i++) scanf("%d", &a[i]); ^ main.cpp:128:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &cl, &cr); ^