Compilare: user.cpp: In function ‘int main()’: user.cpp:43:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "heavymetal.in", "r", stdin ); ^ user.cpp:44:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "heavymetal.out", "w", stdout ); ^ user.cpp:46:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &n ); ^ user.cpp:49:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &v[i].st, &v[i].dr ); ^ user.cpp:56:30: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] d[i]=maxim(d[i-1],d[j]+(v[i].dr-v[i].st)); ^