Compilare: user.cpp: In function ‘int dijkstra(int, int)’: user.cpp:71:14: warning: unused variable ‘iNew’ [-Wunused-variable] int dir, iNew, jNew, i, j, k; ^ user.cpp:71:20: warning: unused variable ‘jNew’ [-Wunused-variable] int dir, iNew, jNew, i, j, k; ^ user.cpp:71:32: warning: unused variable ‘k’ [-Wunused-variable] int dir, iNew, jNew, i, j, k; ^ user.cpp:99:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:102:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gard4.in", "r", stdin); ^ user.cpp:103:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gard4.out", "w", stdout); ^ user.cpp:106:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:110:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &grid[i][j]); ^