Compilare: user.cpp: In function ‘int main()’: user.cpp:24:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[i - 1][j] <= n * 2000000000 && d[i - 1][j] + b * (1 << j) < d[i][j]) ^ user.cpp:26:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[i - 1][j - 1] <= n * 2000000000 && d[i - 1][j - 1] + a * (1 << (j - 1)) < d[i][j]) ^ user.cpp:32:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[n][j] != INF && d[n][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:21:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lld%lld", &a, &b); ^