/in/foo.cc: In function 'int main()':
/in/foo.cc:33:73: error: 't' was not declared in this scope
                     f[s][x1][x2] = max(f[s][x1][x2], f[s - 1][x1][x2] + t);
                                                                         ^
/in/foo.cc:36:77: error: 't' was not declared in this scope
                     f[s][x1][x2] = max(f[s][x1][x2], f[s - 1][x1 - 1][x2] + t);
                                                                             ^
/in/foo.cc:39:77: error: 't' was not declared in this scope
                     f[s][x1][x2] = max(f[s][x1][x2], f[s - 1][x1][x2 - 1] + t);
                                                                             ^
/in/foo.cc:42:81: error: 't' was not declared in this scope
                     f[s][x1][x2] = max(f[s][x1][x2], f[s - 1][x1 - 1][x2 - 1] + t);
                                                                                 ^