Compilare: user.cpp: In function ‘int main()’: user.cpp:97:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l = 0;l < cul.size();l++) ^ user.cpp:53:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("unlock.in","r",stdin); ^ user.cpp:54:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("unlock.out","w",stdout); ^ user.cpp:56:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^ user.cpp:60:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&K); ^ user.cpp:76:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[l][c]); ^ user.cpp:93:40: warning: ‘startj’ may be used uninitialized in this function [-Wmaybe-uninitialized] ok = go(starti,startj,0,target); ^ user.cpp:93:40: warning: ‘starti’ may be used uninitialized in this function [-Wmaybe-uninitialized]