cabane.cpp: In function `void compute_graph()': cabane.cpp:67: warning: comparison between signed and unsigned integer expressions cabane.cpp:68: warning: comparison between signed and unsigned integer expressions cabane.cpp:74: warning: comparison between signed and unsigned integer expressions cabane.cpp:76: warning: comparison between signed and unsigned integer expressions cabane.cpp:79: warning: comparison between signed and unsigned integer expressions cabane.cpp: In function `int main()': cabane.cpp:121: warning: comparison between signed and unsigned integer expressions cabane.cpp:129: warning: comparison between signed and unsigned integer expressions