Compilare: user.cpp: In function ‘void BuildGraph()’: user.cpp:44:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<=mask[i].size();j++){ ^ user.cpp:45:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((j==0||mask[i][j-1]!=0)&&(j==mask[i].size()||mask[i][j]!=0)){ ^ user.cpp:50:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(p=j;p<mask[i].size();p++) ^ user.cpp:52:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(p=0;p<temp.size();p++) ^ user.cpp:55:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(it=temp.begin()+1,p=1;p<temp.size();p++,it++) ^ user.cpp:40:15: warning: unused variable ‘which’ [-Wunused-variable] int i,j,p,which; ^ user.cpp: In function ‘int main()’: user.cpp:73:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(mask[i].size()==k) ^ user.cpp:79:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[i].size();j++){ ^ user.cpp:66:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabane.in","r",stdin); ^ user.cpp:67:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabane.out","w",stdout); ^ user.cpp:69:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^