dag.cpp: In function 'int verif(int)': dag.cpp:20: warning: comparison between signed and unsigned integer expressions dag.cpp: In function 'int main()': dag.cpp:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result dag.cpp:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result