Compilare: user.cpp: In function ‘int main()’: user.cpp:35:27: warning: unused variable ‘k’ [-Wunused-variable] int i, j, soli, solj, k, newi, newj; ^ user.cpp:35:30: warning: unused variable ‘newi’ [-Wunused-variable] int i, j, soli, solj, k, newi, newj; ^ user.cpp:35:36: warning: unused variable ‘newj’ [-Wunused-variable] int i, j, soli, solj, k, newi, newj; ^ user.cpp:33:36: 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:34:38: 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:37:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:40:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &grid[i][j]); ^