Compilare: user.cpp: In function ‘void discharge(int)’: user.cpp:111:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(e[u] > 0) ^ user.cpp: In function ‘int main()’: user.cpp:136:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:141:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &z, &y, &cost); ^