Compilare: main.cpp: In function 'int main()': main.cpp:122:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < edges[0].size() ; i++ ) { ~~^~~~~~~~~~~~~~~~~ main.cpp:132:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < edges[1].size() ; i++ ) { ~~^~~~~~~~~~~~~~~~~ main.cpp:84:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d", &p, &n, &m ) ; ^ main.cpp:86:74: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d %c%c%c%c\n", &u, &v, &s[0], &s[1], &s[2], &s[3] ) ; ^