Compilare: main.cpp: In function 'bool iseuler()': main.cpp:25:24: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if (grd[i] & 1 == 1) { ~~^~~~ main.cpp: In function 'int main()': main.cpp:66:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size() - 1; i++) { ~~^~~~~~~~~~~~~~~~ main.cpp:51:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d\n", &n, &m); ^ main.cpp:54:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d\n", &x, &y); ^