Compilare: user.cpp: In function ‘int main()’: user.cpp:72:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in", "r", stdin); ^ user.cpp:73:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out", "w", stdout); ^ user.cpp:74:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:79:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a.val); ^ user.cpp:109:48: warning: ‘soly’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(verif(solx + dx[i], soly + dy[i]) && mat[solx + dx[i]][soly + dy[i]] == sol - 1) ^ user.cpp:109:48: warning: ‘solx’ may be used uninitialized in this function [-Wmaybe-uninitialized]