Compilare: user.cpp: In function ‘int main()’: user.cpp:38:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j1=1,j2=1;j1<d[i].size() || j2<d[i+1].size();) ^ user.cpp:38:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j1=1,j2=1;j1<d[i].size() || j2<d[i+1].size();) ^ user.cpp:41:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j1==d[i].size()) y=d[i+1][j2++]; ^ user.cpp:42:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(j2==d[i+1].size()) y=d[i][j1++]; ^ user.cpp:61:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) printf("%d ",sol[i]); ^ user.cpp:22:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bucket.in", "r", stdin); ^ user.cpp:23:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bucket.out", "w", stdout); ^ user.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:28:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^