Compilare: user.cpp: In function ‘int main()’: user.cpp:29:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[1 - ind][j] <= n * 2000000000 && d[1 - ind][j] + b * (1 << j) < d[ind][j]) ^ user.cpp:31:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[1 - ind][j - 1] <= n * 2000000000 && d[1 - ind][j - 1] + a * (1 << (j - 1)) < d[ind][j]) ^ user.cpp:37:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[ind][j] != INF && d[ind][j] < min) ^ user.cpp:13:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ user.cpp:26:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lld%lld", &a, &b); ^