Compilare: main.cpp: In function 'int main()': main.cpp:71:25: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=] printf( "%d\n", sum ); ^ main.cpp:72:33: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' [-Wformat=] printf( "%d\n" , way.size() ); ^ main.cpp:57:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "apm.in", "r", stdin ); ^ main.cpp:58:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "apm.out", "w", stdout ); ^ main.cpp:60:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d\n", &n, &m ); ^ main.cpp:64:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d %d\n", &x, &y, &c ); ^