datorii.cpp: In function `void debug()': datorii.cpp:37: warning: comparison between signed and unsigned integer expressions datorii.cpp:40: warning: comparison between signed and unsigned integer expressions datorii.cpp: In function `void build()': datorii.cpp:58: warning: comparison between signed and unsigned integer expressions datorii.cpp:58: warning: comparison between signed and unsigned integer expressions datorii.cpp: In function `void solve()': datorii.cpp:112: warning: comparison between signed and unsigned integer expressions datorii.cpp:115: warning: comparison between signed and unsigned integer expressions datorii.cpp:123: warning: comparison between signed and unsigned integer expressions datorii.cpp:126: warning: comparison between signed and unsigned integer expressions datorii.cpp: In function `void write_data()': datorii.cpp:145: warning: comparison between signed and unsigned integer expressions