Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x][y].size();i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:34:33: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'short int*' [-Wformat=] scanf("%d", &a[i][j]); ^ main.cpp:28:36: 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); ^ main.cpp:29:38: 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); ^ main.cpp:31:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:34:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^ main.cpp:75:38: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] int x=x1+dx[t], y=y1+dy[t]; ^ main.cpp:75:26: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized] int x=x1+dx[t], y=y1+dy[t]; ^