Compilare: user.cpp: In function ‘int main()’: user.cpp:25:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drum2.in", "r", stdin); ^ user.cpp:26:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drum2.out", "w", stdout); ^ user.cpp:29:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:34:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &val[k][i][j]); ^ user.cpp:82:45: warning: ‘jSol’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol.push_back(code[kSol][iSol][jSol]); ^ user.cpp:81:31: warning: ‘iSol’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(!(kSol == 1 && iSol == 1 && jSol == 1)) { ^ user.cpp:81:18: warning: ‘kSol’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(!(kSol == 1 && iSol == 1 && jSol == 1)) { ^