Compilare: user.cpp: In function ‘int main()’: user.cpp:20:34: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] scanf("%d%d%llf",&i,&l,&k),g[i][w[i]++]=l,c[i][l]=k; ^ user.cpp:31:24: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] printf("%.4llf\n",y); ^ user.cpp:18:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:18:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:18:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:20:60: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%llf",&i,&l,&k),g[i][w[i]++]=l,c[i][l]=k; ^