Compilare: user.cpp: In function ‘int main()’: user.cpp:69:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "pscpld2d.in" , "r", stdin ); ^ user.cpp:70:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "pscpld2d.out", "w", stdout ); ^ user.cpp:72:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &N ); ^ user.cpp:76:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%s", A[i] + 1 ); ^ user.cpp:24:45: warning: ‘middle’ may be used uninitialized in this function [-Wmaybe-uninitialized] position = middle - (i - middle); ^ user.cpp:11:30: note: ‘middle’ was declared here int left = 0, right = 0, middle, position; ^ user.cpp:24:45: warning: ‘middle’ may be used uninitialized in this function [-Wmaybe-uninitialized] position = middle - (i - middle); ^ user.cpp:11:30: note: ‘middle’ was declared here int left = 0, right = 0, middle, position; ^